CDO NEWS
--------

Improvement

Version 1.9.5 (9 May 2018):

   New features:
     * Changed type of date from 32 to 64-bit integer to support years > 214748
     * remapycon: optimized by changing cell search method
     * expr: added support for zon<STAT> functions
     * expr: added function sellevelrange() and sellevidxrange()
     * expr: added support for constants
     * gridfile: added extension ":N" to select grid number N from data file
   New operators:
     * dhour<stat> - Multi-day hourly statistics
   Fixed bugs:
     * seldate: segmentation fault (bug introduce in 1.9.4)
     * select: wrong timestamp when combining select with selyear (bug introduce in 1.8.1) [Bug #8576]
     * gradsdes: bug fix for rotated lon/lat grids
     * silent option produces newlines [Bug #8538]
     * remapnn/remapdis: wrong result with regular 2D source grids if nlat > nlon  [Bug #8498]

Version 1.9.4 (9 May 2018):

   New features:
     * Large data support: changed type of gridsize from 32 to 64-bit integer
     * remapbil, remapbic, remapnn, remapdis: optimized by changing point search method
     * Fldstat, Vertstat: added option weight=false to disable weighting
   Fixed bugs:
     * option -r doesn't work [Bug #8334]
     * enspctl: changed parameter type from int to float [Bug #8386]
     * segfault with chained operators on timeseries data [Bug #8230]
     * setattribute: added support for \n in text attributes
     * expr: removed character [LlDd] from definition of float constants
     
Version 1.9.3 (29 January 2018):

   New features:
     * expr: added time coordinate function cdate(), ctime(), cdeltat(), ctimestep() ...
   New operators:
     * not - logical NOT (1, if x equal 0; else 0)
   Fixed bugs:
     * uvDestag: target grid undefined in output
     * runpctl: fails since release 1.8.0
     * read of reduced Gaussian grid description file failed [Bug #8146]
     * read error on grid description file [Bug #8099]

Version 1.9.2 (23 November 2017):

   Fixed bugs:
     * sign of grid size increment changes [Bug #7974]
     * compilation fails on OpenBSD [Bug #7961]
     * expr: nesting of ternary operator lost in cdo-1.9.1 [Bug #7992]
     * rotuvb changed behavior in different versions [Bug #8084]
     * select with start=end range aborts with 'Invalid character' [Bug #7976]

Version 1.9.1 (27 September 2017):

   New features:
     * Added support for NC_FORMAT_CDF5
     * Extend option --reduce_dim to all dimension for all operators
   New operators:
     * tee - Duplicate a data stream
   Changes operators:
     * eof, eof3d: set default value of environment variable CDO_WEIGHT_MODE to off
     * sinfo: Added time type
     * ap2pl: added support for input data on half levels
   Fixed bugs:
     * selindexbox: breaks uvRelativeToGrid flag [Bug #7901]
     * expr: AND fall through OR
     * --cmor option doesn't work for lon/lat bounds (introduced in 1.9.0)
     * eof3d: weight array was allocated for only one level

Version 1.9.0 (27 July 2017):

   New features:
     * Code changed from ANSI C99 to ISO C++11
     * Added configure option for ecCodes --with-eccodes=<yes|no|directory>
     * Added range operator to all statistic modules (e.g. yearrange, zonrange)
   Fixed bugs:
     * expr: improve ternary operator, no brackets needed anymore.
     * expr: added support for clev in ternary operator.
     * remapcon/remapycon produces wrong results for some grid combinations (introduced in 1.8.0) [Bug #7821]
     * mergetime: wrong time information if first input file does not contain the first time step (bug introduced in 1.8.1) [Bug #7760]
     * percentile: fix wrong result with method numpy (linear interpolation) and nist [Bug #7798]

Version 1.8.2 (15 May 2017):

   Fixed bugs:
     * setpartab: variable name does not change [Bug #7681]
     * cmorlite: skipped empty key values [Bug #7681]
     * setcalendar, settaxis memory error (bug introduce in 1.8.1) [Bug #7691]

Version 1.8.1 (6 April 2017):

   New features:
     * selindexbox: added support for LCC grid
   New operators:
     * selgridcell - Select grid cells
     * delgridcell - Delete grid cells
   New operators (KMNI contribution):
     * selmulti - Select multiple fields
     * delmulti - Delete multiple fields
     * changemulti - Change identication of multiple fields
     * samplegrid - Resample grid
     * uvDestag - Destaggering of wind components
     * rotuvNorth - Rotate u/v wind to North pole
     * projuvLatLon - Cylindrical Equidistant projection
   Fixed bugs:
     * collgrid: combination of nx and names does not work
     * Remapping bug for non global grids [Bug #7625]
     * remapdis and remapcon produces wrong results for some grid combinations [Bug #7626] (introduced in last revision)

Version 1.8.0 (26 October 2016):

   New features:
     * NetCDF: Improved support for horizontal and vertical grids 
     * Changed default of option -f nc to netCDF2
     * masklonlatbox: added support for unstructured grids
     * setpartabn: added support for user defined attributes
     * Reverse: adjust date/time by -1 second (introduced in last revision)
   New operators:
     * setattribute: Set attributes
     * cmorlite: Apply variable_entry of cmor tables
     * timcumsum: Cumulative sum over time.
     * shiftx/shifty: Shift fields on rectilinear/curvilinear grids in x/y direction
   Fixed bugs:
     * Cond: bug fix for ntsteps1 == 1 && ntsteps2 != 1
     * ml2pl: interpolation failed for data on hybrid half levels [Bug #7225]

Version 1.7.2 (28 June 2016):

   New features:
     * Adjust date/time by -1 second if the varification time is 00:00:00 and
       the verification date is equal to upper time bound
   New operators:
     * smooth: Smooth grid points
     * ap2hl: Air pressure to height level interpolation
     * ngrids: Show number of grids
     * ngridpoints: Show number of gridpoints per variable
     * reducegrid: Select gridpoints wrt. given mask
     * settbounds: Set time bounds
   Changed operators:
     * input: added optional zaxis parameter
     * setpartab: renamed to setcodetab
     * pardes: renamed to codetab
   Fixed bugs:
     * Error reading Gaussian reduced GRIB files [Bug #6780 #6819]
     * Installation error with OpenMP [Bug #6523]
     * mul: wrong result for missval*0 (bug was introduced in 1.7.1)
     * nint: wrong result (replaced round() by lround())
     * shaded, contour, grfill: set NAN missvals to -9e33 [Bug: #6677]
     * expr: fix problem with missing values in time constant mask and a timeseries

Version 1.7.1 (25 February 2016):

   New features:
     * select: added search key steptype, gridnum, gridname, zaxisnum, zaxisname
     * expr, exprf, aexpr, aexprf: added support for function clon(x), clat(x), clev(x),
       remove(x), ngp(x), nlev(x), size(x), missval(x), sellevel(x,k), sellevidx(x,k),
       fldmin(x), fldmax(x), fldsum(x), fldmean(x), fldavg(x), fldstd(x), fldstd1(x), fldvar(x), fldvar1(x),
       vertmin(x), vertmax(x), vertsum(x), vertmean(x), vertavg(x), vertstd(x), vertstd1(x), vertvar(x), vertvar1(x)
   New operators:
     * contour: Contour plot
     * shaded: Shaded contour plot
     * grfill: Shaded gridfill plot
     * vector: Lat/Lon vector plot
     * graph: Line graph plot
     * gmtxyz: Output GMT xyz format to create contour plots with the GMT module pscontour.
     * gmtcells: Output GMT multiple segment format to create shaded gridfill plots with psxy.
   Fixed bugs:
     * cdo -t table_file does not read variable name from table file [Bug #6312]
     * One day shift backwards when converting to relative time axis with -r [Bug #6496]
     * ydaypctl: check of verification date failed (bug fix)
     * cat, copy, mergetime, select: remove time constant input fields for nfile>1 [Bug #6552]

Version 1.7.0 (28 October 2015):

   New features:
     * added support for netCDF Scalar Coordinate Variables
     * added support for hybrid sigma pressure coordinates following the CF convention
     * added option --percentile to select different percentile methods
       Available methods: nrank, nist, numpy, numpy_lower, numpy_higher, numpy_nearest
     * distgrid: added support for curvilinear grids
     * collgrid: added support for curvilinear grids
   New operators:
     * remapycon: First order conservative remapping (new implementation of remapcon)
     * genycon: Generate 1st order conservative remap weights (new implementation of gencon)
     * setmisstonn: Set missing value to nearest neightbor
     * setmisstodis: Set missing value to the distance-weighted average of the nearest neighbors
     * ap2pl: Interpolate 3D variables on hybrid sigma height coordinates to pressure levels
     * vertstd1: Vertical standard deviation [Divisor is (n-1)]
     * vertvar1: Vertical variance [Divisor is (n-1)]
     * seasvar1: Seasonal variance [Divisor is (n-1)]
     * seasstd1: Seasonal standard deviation [Divisor is (n-1)]
     * yseasvar1: Multi-year seasonally variance [Divisor is (n-1)]
     * yseasstd1: Multi-year seasonally standard deviation [Divisor is (n-1)]
   Changed operators:
     * remapnn, remapdis: replaced scrip search by kdtree (optimization)
     * vertvar, vertstd: changed to weighted var/std if layer bounds are available
   Fixed bugs:
     * cdo -t table_file does not complain if table_file is a directory [Bug #5891]
     * expr: operators return 0 for arithmetics on constants [Bug #5875]
     * env. CDO_TIMESTAT_DATE does not work [Bug #5758]
     * splityear*: support for constant fields is missing [Bug #5759]
     * yseaspctl: check of verification date failed [Bug #5810]
     * Converting rotated lat-lon netcdf to/from grib: flip sign of the angle of rotation [Bug #5870]

Version 1.6.9 (28 April 2015):

   New features:
     * select: added parameter date, startdate, enddate 
     * expr: added support for operator ?:,&&,||
     * option --reduce_dim: reduce dimension (Timstat, Fldstat)
   New operators:
     * after: ECHAM standard post processor
     * aexpr: Evaluate expressions and append results
     * aexprf: Evaluate expression script and append results
     * selzaxisname: Select z-axes by name
     * genlevelbounds: Generate level bounds
   Fixed bugs:
     * ydrunpctl: does not work in combination with ydrunmin/ydrunmax
     * Ensstat: added support for different missing values
     * seltimestep: abort if none of the selected timesteps are found

Version 1.6.8 (26 March 2015):

   New features:
     * select, delete: added wildcard support for parameter name
     * expr: added support for logical operators <, >, <=, >=, !=, ==, <=>
   New operators:
     * splityearmon: Split in years and months
     * yseasadd: Add multi-year seasonal time series
     * yseassub: Subtract multi-year seasonal time series
     * yseasmul: Multiply multi-year seasonal time series
     * yseasdiv: Divide multi-year seasonal time series
   Changed operators:
     * vertmean, vertavg: changed to weighted means if layer bounds are available
     * setpartabp, setpartabn: added optional parameter convert to convert the units.
       Units are not converted anymore if this parameter is not set!
     * TimSTAT, Timpctl, TimselSTAT, Timselpctl, SeasSTAT, Seaspctl:
       The output time stamp of all operators from the above modules
       are changed from the last to the middle contributing timestep.
       Use the environment variable CDO_TIMESTAT_DATE=last to set
       the output time stamp to the last contributing timestep.
     * eof, eof3d: use area weights instead of no weights
       Use the environment variable CDO_WEIGHT_MODE=off to switch back to
       the non weighted version
   Fixed bugs:
     * gradsdes: grib index file is empty (introduced in 1.6.7)
     * grib2 output: segfaults when writing grib2 files [Bug #5351]
     * remapnn: Segmentation fault for extrapolation of regular 2D source grids [Bug #5448]

Version 1.6.7 (12 December 2014):

   Fixed bugs:
     * intlevel3d: does not work
     * GRIB_API: segfaults when writing grib2 files [Bug #5351]

Version 1.6.6 (27 November 2014):

   New operators:
     * outputtab: table output
   Fixed bugs:
     * option -t table: segmentation fault if parameter table entry longname is missing
     * merge: check number of timesteps [Bug #5338]
     * seasmean: sets all time_bnds to the same values [Bug #5329]
     * histcount: doesn't recognize missing values
     * filesdes: doesn't work for GRIB2 files [Bug #5307]

Version 1.6.5 (23 October 2014):

   New operators:
     * distgrid: distribute horizonal grid
     * collgrid: collect horizontal grid
   Changed operators:
     * cat: added support for option -O (overwrite existing output file)
     * remaplaf: changed calculation of weights from SCRIP to YAC
   Fixed bugs:
     * gridarea: added support for concave grid cells
     * gradsdes: added support for option 365_day_calendar
     * import_binary: option 365_day_calendar does not work
     * select: wrong result when select only one timestep

Version 1.6.4 (26 June 2014):

   New features:
     * Option --history: Do not append to netCDF "history" global attribute
     * Option --netcdf_hdr_pad <nbr>: Pad netCDF output header with nbr bytes
   New operators:
     * setpartabn: set parameter table by name
     * setpartabp: set parameter table by parameter ID
     * sealevelpressure: sea level pressure
   Changed operators:
     * Sinfo: changed format of grid and zaxis section
     * Filter: disable zero-padding
     * diff: print number of different values
     * Ymonstat: sorts output by month of year
   Fixed bugs:
     * eof3d: set sum of weights to 1
     * eofcoeff: remove scaling with grid cell area weights
     * eofcoeff3d: remove scaling with grid cell area weights

Version 1.6.3 (18 February 2014):

   New features:
     * remapbil, remapbic, remapdis, remapnn: performance optimization for regular 2D source grids
     * gradsdes: added support for GRIB files >2GB
     * eca_csu: added number of csu periods with more than 5days per time period
     * eca_cfd: added number of cfd periods with more than 5days per time period
     * expr: select variables by name
   Changed operators:
     * gradsdes: added parameter map_version and removed specific operators gradsdes1 and gradsdes2
   Fixed bugs:
     * gradsdes: changed LCC to LCCR in PDEF definition [Bug #4344]
     * cat: "Segmentation fault" if the output file already exist [Bug #4291]
     * delete: parameter level does not work [Bug #4216]

Version 1.6.2 (12 November 2013):

   New features:
     * select: added support for key >timestep_of_year<
     * mastrfu: added missing value support
     * splitmon: added optional parameter to set the format string for the month
   Fixed bugs:
     * selyear: wrong result for negative years [Bug #3836]
     * eca_gsl: start date of growing season is wrong if the length of growing season is zero

Version 1.6.1 (27 June 2013):

   New features:
     * support of blanks in filenames and parameter
   Changed operators:
     * gradsdes: added support for netCDF files
     * Info: add chunking information of netcdf files (only with verbose output) [Feature #3489]
     * select: added support for key >hour<
   Fixed bugs:
     * fldcor: check missing value of 2. input file
     * enscrps: wrong result since CDO version 1.5.6 [Bug #3403]
     * selmon: month not found for negative years [Bug #3439]
     * shifttime: wrong result for negative hours and days [Bug #3440]
     * inttime: removes last time step [Bug #3611]

Version 1.6.0 (14 March 2013):

   New operators:
     * select: Select fields from an unlimited number of input files
     * mergegrid: Merge horizontal grids
     * yearmonmean: yearly mean from monthly data
     * duplicate: Duplicates a dataset
     * adisit: Potential temperature to in-situ temperature
     * rhopot: Calculates potential density
   Changed operators:
     * setcalendar: changed CDO calendar names to CF calendar names (Feature #3123)
                    (standard, proleptic_gregorian, 360_day, 365_day, 366_day)
     * masklonlatbox: added support for curvilinear grids
     * diff: print only records that differ
   Fixed bugs:
     * sellonlatbox: wrong result with overlapped lonlatbox on curvilinear grids
     * ensrkhisttime: fixed memory fault
     * expr: wrong result for operation var1/var2 where var2 = 0
     * Runstat: added support for time bounds (Bug #3127)
     * merge: uses size of the first input file for the output buffer

Version 1.5.9 (17 December 2012):

   New features:
     * cdo option -z zip: added optional compression level -z zip[_1-9]
     * cdo: added option -k <chunktype> to set the chunk type to auto, grid or lines
     * Added workaround to combine CDO operators with the result of mergetime, merge, copy, cat, ens<STAT>
       - use one input parameter with wildcards in single quotes, e.g.: 'ifile?_*' 
   Changed operators:
     * enlarge: added missing value support
   Fixed bugs:
     * gradsdes: failed
     * sellevel: loosing level bounds
     * wrong result for user defined lonlat grids with xfirst < 0
       (This bug was introduced in CDO version 1.5.8)

Version 1.5.8 (30 October 2012):

   New features:
     * Added support for netCDF4(HDF5) formatted SCRIP grid description files
     * added CDO option -L to lock all I/O calls. This option is neccessary if external I/O libraries like 
       netCDF4 (HDF5) were installed without thread-safe support.
   New operators:
     * setunit: Set variable unit
     * chunit:  Change variable unit
   Changed operators:
     * Info:  changed output format
     * Sinfo: changed output format
     * Diff:  changed output format
   Fixed bugs:
     * remaplaf: fixed bug in binary_search_int()
     * eca_rr1: result has wrong long name attribute

Version 1.5.6.1 (26 July 2012):

   Fixed bugs:
     * Wrong results with the following statistical functions:
         *mean, *avg, *sum, *var, *std
       only if all of the following conditions are complied:
         - x86_64 machine (tornado, squall, thunder, lizard)
         - dataset has no missing values
         - the horizontal grid size is > 1 and not multiple of 8
       This bug was introduced in CDO version 1.5.6.

Version 1.5.6 (23 July 2012):

   New features:
     * Runstat: OpenMP parallelization over parameter nts
     * import_binary: added support for 64-bit floats via extra OPTION keyword flt64 
   New operators:
     * showunit: show unit of a parameter
   Changed operators:
     * Arith: added support for 3D masks
     * mastrfu: use grid coordinates from input file
   Fixed bugs:
     * ymonsub: added support for time bounds
     * Wrong netCDF output for unscaled uint8, int8, int16, int32 variables [Bug #2516]

Version 1.5.5 (15 May 2012):

   New operators:
     * yhouradd, yhoursub, yhourmul, yhourdiv: Multi-year hourly arithmetic
   Fixed bugs:
     * ECA operators: wrong result if missing value is not the default missing value (-9e33)
     * ml2pl: added support for GRIB2 parameter names
     * replace: removed debug output 

Version 1.5.4 (30 January 2012):

   New features:
     * setgridtype: added parameter lonlat to convert curvilinear to regular lon/lat grids
     * remapcon: added env REMAP_AREA_MIN, to set the minimum area fraction
   New operators:
     * timcovar: covariance over time
     * fldcovar: covariance in grid space
   Fixed bugs:
     * splitsel: added support for constant fields [Bug #1701]
     * combination of selection commands (e.g. selmon -selyear) do not terminate, if no result found [Bug #1640]

Version 1.5.3 (20 October 2011):

   New features:
     * Variable input parameter for ECA operators: eca_cdd, eca_cwd, eca_rr1, eca_sdii
   Fixed bugs:
     * deflate compression with netCDF4 doesn't work (option: -z zip)
     * sellonlatbox: correct lon bounds if necessary
     * ifthen, ifthenelse: uses only the first time step of the first input file
     * module Monarith (monadd, monsub, monmul, mondiv): wrong result for 3D variables

Version 1.5.2 (22 August 2011):

   New features:
     * replace: added support to replace single levels
   Changed operators:
     * remapeta: Changed minimum pressure level for condensation from 1000Pa to 0Pa.
                 Use the environment variable REMAPETA_PTOP to set the minimum pressure level for condensation. 
                 Above this level the humidity is set to the constant 1.E-6.
   Fixed bugs:
     * invertlat: bug fix for CURVILINEAR grids
     * ymon<stat>: preserve time axis attributes (type and calendar)
     * import_binary: added support for OPTION ZREV
     * expr/exprf: wrong result for expression 'constant-field' and 'constant/field' (e.g. 1-field)
                   This bug was introduced in CDO version 1.5.1.
     * eof, eoftime, eofspatial, eof3d - Empirical Orthogonal Functions: 
            There was a bug in the calculation of the Frobenius norm, which has only been triggered in some cases
            when using a low precision. The normalization has been changed thus that the eigenvectors are not weighted 
            and their absolute is 1. The default settings for convergence have been changed to be more conservative:
            CDO_SVD_MODE=jacobi    MAX_JACOBI_ITER=12   FNORM_PRECISION=1.e-12

Version 1.5.1 (12 July 2011):

   New features:
     * Added support for netCDF4 classic format; option -f nc4c
     * import_binary: Added support for 1 and 2 byte integer
   New operators:
     * intlevel3d: vertical interpolation to/from 3d vertical coordinates
     * ensrkhistspace: Ranked Histogram averaged over time
     * ensrkhisttime:  Ranked Histogram averaged over space
     * ensroc:  Ensemble Receiver Operating characteristics
     * enscrps: Ensemble CRPS and decomposition
     * ensbrs:  Ensemble Brier score
   Fixed bugs:
     * Exprf: wrong result for missing values != (double) -9.e33
     * detrend: added support for time bounds
     * Filter: added support for time bounds
     * eofspatial: integer overflow; wrong result for grid size > 46340
     * eca_*: use the input calendar for the output streams

Version 1.5.0 (15 March 2011):

   New features:
     * GRIB2 support via ECMWF GRIB_API
     * Added support for netCDF level bounds
     * Added option -O to overwrite existing output file (only for ens<STAT>, merge, mergetime)
   New operators:
     * selparam: Select parameters by identifier
     * delparam: Delete parameters by identifier
     * splitparam: Split parameter identifiers
     * chparam: Change parameter identifier
   Changed operators:
     * expr: added functions abs(), int(), nint(), sqr()
     * sinfo: changed output of table and code number to parameter identifier
     * info:  changed output of code number to parameter identifier
     * diff:  changed output of code number to parameter identifier
   Fixed bugs:
     * sellonlatbox: does not work as expected when selecting all longitudes
     * sellonlatbox: initialization missing for unstructured grids
     * ml2pl and ml2hl: wrong result if input file contains full *and* half level data
     * trend and detrend: integer overflow; wrong result for ntimesteps > 46340
     * spcut: only correct results with continuous wave numbers starting at 1
     * remaplib: fixed data race in calculation of bin_addr (OpenMP)

Version 1.4.7 (06 January 2011):

   New features:
     * improved support for netCDF output from WRF model (import time and grid variables)
   New operators:
     * ydayadd, ydaysub, ydaymul, ydaydiv: Multi-year daily arithmetic
     * eca_pd: Precipitation days index per time period
     * dv2ps: Divergence and vorticity to velocity potential and stream function
   Changed operators:
     * import_cmsaf: added time information also for time constant fields
   Fixed bugs:
     * eof: fix memory access violation
     * eofcoeff: fix memory access violation
     * fldmean: gives wrong result for grid units [radian]
     * Yseasstat: bug fix for datasets with time constant fields
     * sellevel: fix problem with hybrid model levels and netCDF output
     * sellonlatbox: fix rounding error of the last lon index
     * Settime: bug fix for time independent variables in combination with other operators (pipes)

Version 1.4.6 (17 September 2010):

   New features:
     * Using libtool for linking (rpath)
     * Changed predefined gaussian grid names from t<RES>grid to n<N>
       Use n80 instead of t106grid to define a Gaussian N80 grid
     * Changed percentile parameter type from integer to float
   New operators:
     * bandpass: Bandpass filtering
     * lowpass:  Lowpass filtering
     * highpass: Highpass filtering
   Changed operators:
     * eca_gsl: adjust implementation to fit definition by ECA
     * expr, exprf: added missing values support
   Fixed bugs:
     * sellevel: copy zaxis meta data name and units
     * seldate: open output file only when time steps found
     * sellonlatbox: fix rounding error of the last lon index

Version 1.4.5.1 (05 July 2010):

   New features:
     * GRIB1 decode: Correct ZeroShiftError of simple packed spherical harmonics
   Fixed bugs:
     * wrong result of SZIP compressed GRIB1 records with 24 bit packing and a compression ratio < 1.05 

Version 1.4.5 (28 June 2010):

   New operators:
     * eof: Calculate EOFs in spatial or time space
     * eoftime: Calculate EOFs in time space
     * eofspatial: Calculate EOFs in spatial space
     * eofcoeff: Principal coefficients of EOFs
     * consecsum: Consecutive Sum
     * consects: Consecutive Timesteps
     * setvals: Set list of old values to new values

Version 1.4.4 (29 April 2010):

   New operators:

     * fldcor: correlation in grid space
     * timcor: correlation over time
     * gridbox<stat>: computes statistical values over surrounding grid boxes

   Changed operators:

     * import_binary: added support for variables with different number of levels
     * random: added optional parameter 'seed'

   Fixed bugs:

     * standard deviation: changed the result from missval to zero, if variance is zero
     * fldsum: change result from 0 to missval, if only missing values found
     * intyear: set the interpolation result always to missval, if missing values found
     * Added support for netCDF time bounds
     * sellonlatbox: parameter lon2 was not inclusiv
     * expr: added support for calculations of const/var
     * setday: writes sometimes wrong date information with GRIB result from afterburner
     * inputsrv: added level information
     * merge: added support to merge levels with datasets in netCDF format

Version 1.4.3 (22 February 2010):

   * New features:
      o using CDI library version 1.4.3
        improved GRIB1 support and performance
      o changed GRIB1 default packing type of spherical harmonics to complex

Version 1.4.2 (8 February 2010):

   * Changed operators:
      o remapcon, remaplaf: speed up by fast store of links
      o replace: added support for time constant fields
      o module Genweights: use netCDF2 (64bit) for large remap weights files
      o module Zonstat, Merstat: added support for generic grids
      o module Ensstat: don't overwrite existing files
      o import_cmsaf: added more corrections for wrong projection parameter

Version 1.4.1 (15 December 2009):

   * New features:
      o using CDI library version 1.4.1
        improved GRIB and netCDF support and performance
   * New operators:
      o splittabnum - Split parameter table numbers
      o sethalo - Set the left and right bounds of a field
   * Changed operators:
      o merge, mergetime: don't overwrite existing files
      o showtime: removed output of date, only print time string hh:mm:ss
   * Fixed bugs:
      o remap: bug fix for weights from gennn (set remap_extrapolate = TRUE)

Version 1.4.0.1 (21 October 2009):

   * Fixed bugs:
      o seltime: bug fix for scanning of input parameter
      o IEG format: bug fix for identification of lonlat grids
      o GRIB format: bug fix for decoding of missing values (scalar version only)

Version 1.4.0 (5 October 2009):

   * New features:
      o added support of time units 'seconds' to all operators
   * New operators:
      o Import binary data sets (via a GrADS data descriptor file) - import_binary
      o Set valid range - setvrange
   * Changed operators:
      o gridarea: added support for hexagonal GME grid and tripolar MPIOM grid
      o remapnn: added support for unstructured grids without bounds (full grid search)
      o Seasstat: added env. CDO_SEASON_START to set the start month of seasons
      o ieg format: added support for Gaussian grids
   * Fixed bugs:
      o shifttime: bug fix for negative time increments
      o import_cmsaf: read native float datatype

Version 1.3.2 (15 June 2009):

   * New features:
      o Changed compiler to ANSI C99
      o Added option -Q to sort netCDF variable names
   * Changed operators:
      o splitsel: changed the number of output digits from 3 to 6
      o remapeta: correct humidity up to highest level *nctop* where condensation is allowed
      o remapcon: change max_subseg from 1000 to 100000
   * Fixed bugs:
      o settaxis: bug fix for time increment 'months'
      o remaplaf: fixed buffer overflow
      o remapdis, remapnn: set num_srch_bins to 1 if REMAP_EXTRAPOLATE=OFF

Version 1.3.1 (16 April 2009):

   * New features:
      o The default calendar is now set to "proleptic gregorian".
        To use a standard calendar set the environment variable CDI_CALENDAR=standard.
      o Added support for Lambert Conformal Conic projections
      o Added support for missval = NaN
   * Changed operators:
      o ml2pl: added support for Geopotential Height
      o Settime: added "seconds" support to operator "settunits", "settaxis" and "shifttime"
      o percentile: change default number of bins from 100 to 101
   * Fixed bugs:
      o import_cmsaf: bug fix for datasets with gain/offset and more than 1 timestep
      o remaplaf: bug fix for fields with missing values
      o remapnn: bug fix for distance equal zero
      o mermean: bug fix for weights from 'zonmean' (cdo mermean -zonmean)
      o chlevel: fixed bug that happens when the list of oldlev,newlev 
                 contains the same level more than once

Version 1.3.0 (15 January 2009):

   * New features:
      o add support for Sinusoidal and Lambert Azimuthal Equal Area projections
   * New operators:
      o Second order conservative remapping - remapcon2
      o Nearest neighbor remapping - remapnn
      o Largest area fraction remapping - remaplaf
      o Reciprocal value - reci
   * Changed operators:
      o import_cmsaf: add support for monthly mean diurnal cycle
      o remap: set num_srch_bins to nlat/2 (speedup)
   * Fixed bugs:
      o setzaxis: changed datatype from float to double
      o sellonlatbox: bug fix for curvilinear grids
      o merge: bug fix for usage in CDO pipes
      o gridarea, gridweights: bug fix for gridboxes with delta lon >= 180 degree
      o intlevel: bug fix for datasets with missing values
      o yseasstd, yseasvar: fixed wrong array index

Version 1.2.1 (13 November 2008):

   * New features:
      o Option '-u' to determinate whether to overwrite existing files
   * New operators:
      o Import CM-SAF files - import_cmsaf
      o Mathematical function 'power' - pow
   * Changed operators:
      o sellonlatbox: add support for grid type 'CELL' and units 'radians'
      o remapdis: add support for grid type 'CELL' without bounds (full grid search)
      o Timstat: use time axis with bounds from input
      o copy, cat: concatenate time constant fields
   * Fixed bugs:
      o zonvar: activation was missing
      o ifthen:  bug fix for datasets with different missing values
      o runmean: bug fix for datasets with missing values

Version 1.2.0 (13 August 2008):

   * New features:
      o add support for netCDF4 classic with deflate (option -z zip)
   * New operators:
      o Linear level interpolation - intlevel
      o Invert levels - invertlev
      o Select levels by index - sellevidx
      o Import AMSR binary files - import_amsr
   * Changed operators:
      o remapeta: add missing value support
   * Fixed bugs:
      o Operator yseasmean, yhourmean and ydaymean: bug fix for datasets with missing values
      o Module Ninfo and Showinfo: bug fix for datasets with time constant parameter only
        Affected operators: ndate, nmon, nyear, showdate, showtime, showmon, showyear

Version 1.1.1 (8 April 2008):

   * New features:
      o Module Vertint: add support for GME data

   * New operators:
      o Regression - regres
      o Grid cell area/weights - gridarea, gridweights
      o Z-axis description - zaxisdes

   * Fixed bugs:
      o Module Exprf: using MT safe version of bison and flex
      o Module Vertint: bug fix for input with time constant fields
      o Module Arithc: recalculate number of missing values
      o Operator splitsel: bug fix for multilevel/multivar datasets

Version 1.1.0 (25 January 2008):

   * New features:
      o Support for Lambert conformal grids in GRIB format
      o Improved support for netCDF attributes

   * New operators:
      o Monthly arithmetic - monadd, monsub, monmul, mondiv

   * Fixed bugs:
      o Operator setlevel and chlevel: bug fix for usage in pipes
      o Operator cat: bug fix for large existing output files (>2GB) on 32-bit machines
      o Operator gradsdes: bug fix for monthly mean data with start day > 28
      o Operator expr: change exponent precedence from left to right

Version 1.0.9 (22 October 2007):

   * New operators:
      o Multi-year hourly statistical values
         - yhourmin, yhourmax, yhoursum, yhourmean, yhouravg, yhourstd, yhourvar
   * Changed operators:
      o ymonstat: write original order of timesteps
      o gradsdes: add GRIB level type to VARS
   * Fixed bugs:
      o Operator ifthen: bug fix for masks that varies not with time


Version 1.0.8 (27 June 2007):

   * New operators:
      o Remap vertical hybrid level - remapeta
      o 9 point smoothing - smooth9
      o Mask region - maskregion
      o Split selected time steps - splitsel
      o Set range to constant - setrtoc, setrtoc2
      o Histogram - histcount, histsum, histmean, histfreq
      o Show GRIB level types - showltype
      o Select GRIB level types - selltype
      o Set GRIB level type - setltype
   * Changed operators:
      o Renamed chvar, selvar, delvar, showvar, setvar and splitvar
             to chname, selname, delname, showname, setname and splitname
      o Renamed selmin, selmax, selsum, selmean, selavg, selvar, selstd
             to timselmin, timselmax, timselsum, timselmean, timselavg, timselvar, timselstd
      o Renamed selpctl to timselpctl
      o Renamed nvar to npar and vardes to pardes
   * Fixed bugs:
      o Module Ymonstat gave wrong results with missing values
        Affected operators: ymonmean, ymonstd, ymonvar
      o Library ieglib has had a memory leak for IEG output

Version 1.0.7 (8 March 2007):

   * New operators:
      o Divergence and vorticity to U and V wind (linear) - dv2uvl
      o U and V wind to divergence and vorticity (linear) - uv2dvl
      o Select single month - selsmon
   * Changed operators:
      o tchill is renamed to wct
      o eca_strwind is split into eca_strwin, eca_strbre, eca_strgal and eca_hurr
   * Fixed bugs:
      o fldmax has had wrong results if the field has
        missing values and all other values are less than zero.

Version 1.0.6 (12 December 2006):

   * New operators:
      o Variance for all statistic modules
         - vertvar, timvar, yearvar, monvar, dayvar, hourvar,
           runvar, seasvar, selvar, ydayvar, ydrunvar, ymonvar, yseasvar

Developer version 1.0.5 (30 November 2006):

  * New operators:
      o Show file format - showformat 
      o Windchill temperature - tchill
      o Humidity index - hi
      o ECA Indices of Daily Temperature and Precipitation Extremes
        - eca_* (37 different indices!)

Developer version 1.0.4 (7 November 2006):

  * New operators:
      o Multi-year daily running statistical values
         - ydrunmin, ydrunmax, ydrunsum, ydrunmean, ydrunavg, ydrunstd
      o Percentile values for different time ranges
         - timpctl, hourpctl, daypctl, monpctl, yearpctl, selpctl, runpctl, seaspctl
      o Multi-year percentile values
         - ydaypctl, ymonpctl, yseaspctl, ydrunpctl
      o Ensemble and field percentiles
         - enspctl, fldpctl, zonpctl, merpctl

Developer version 1.0.3 (3 November 2006):

  * New operators:
      o Time interpolation - intntime 
      o Backward transformation of velocity components U and V from MPIOM - mrotuvb

Version 1.0.2 (18 September 2006):

  * Rename operator gradsdes to gradsdes1 and set the alias gradsdes to gradsdes2
  * Remapping of rotated lonlat grids with remapbi* and genbi* has been changed at the bounds.
    Generated interpolation weights with older CDO versions can't be used anymore and must
    be recalculated with genbi*.
  * New operators:
      o ydaysum - Multi-year daily sum
      o ymonsum - Multi-year monthly sum
      o yseassum - Multi-year seasonally sum
      o int - Convert to integer value
      o nint - Convert to nearest integer value

Version 1.0.1 (1 August 2006):

  * New CDO option '-b' to set the number of bits for the output precision
  * New operators:
      o selstdname - Select standard names
      o showstdname - Show standard names
      o setclonlatbox - Set a longitude/latitude box to constant [Etienne Tourigny]
      o setcindexbox - Set an index box to constant

Version 1.0.0 (15 June 2006):

  * New operators:
      o dv2ps - Divergence and vorticity to velocity potential and stream function

Version 0.9.13 (4 May 2006):

  * New operators:
      o mergetime - Merge datasets sorted by date and time
      o input, inputext, inputsrv - ASCII input
      o abs - Absolute value
      o atan2 - Arc tangent of two fields

Version 0.9.12 (6 March 2006):

  * New operators:
      o uv2dv, dv2uv - Wind transformation

Version 0.9.11 (1 Februar 2006):

  * Support of GME grids
  * New operators:
      o selmin, selmax, selsum, selmean, selavg, selstd - Time range statistic
      o sp2gpl, gp2spl - Spectral transformation of TL-Model data (e.g. ERA40)
      o replace - Replace variables

Version 0.9.10 (19 December 2005):

  * Support of REMO IEG format
  * New operators:
      o ifthenelse - IF ifile1 THEN ifile2 ELSE ifile3

Version 0.9.9 (19 October 2005):

  * New operators:
      o ensmin, ensmax, enssum, ensmean, ensavg, ensstd, ensvar - Ensemble statistic
      o gradsdes2 - Creates a GrADS data descriptor file with a portable GrADS map
      o enlarge - Enlarge all fields to a user given grid
      o gencon - Generate conservative interpolation weights
      o remap - Remapping with the interpolation weights from a netCDF file 

Version 0.9.8 (19 July 2005):

  * New operators:
      o setlevel - Set level
      o chlevel - Change level 
      o chlevelc - Change level of one code
      o chlevelv - Change level of one variable

Version 0.9.7 (26 May 2005):

  * New operators:
      o setcalendar - Set calendar
      o masklonlatbox - Mask lon/lat box
      o maskindexbox - Mask index box
      o muldpm - Multiply with days per month
      o divdpm - Divide with days per month
 

Version 0.9.6 (4 April 2005):

  * Support of rotated regular grids.
  * New operator:
      o detrend - Linear detrending of time series. 

Version 0.9.4 (3 Jan 2005):
 
  * Support of PINGO grid description files. 
  * New operator: 
      o gradsdes - Creates a GrADS data descriptor file.
                   Supported file formats are GRIB, SERVICE and EXTRA. 
