Release 0.8.0:
  * now depends on ocamlrss >= 2.1.0
  * add: handle stog:archived-elts to indicate the types of elements appearing
    in archive tree
  * mod: do not issue twice the same warning message
  * add: <latex> uses latex-svg-scale (default is 1.1) if defined in the
    environment when producing .svg files

Release 0.7.0:
  * mod: split (un)install target into (un)install-lib and (un)install-bin
  * add: -I and -package options to stog-ocaml-session
  * add: new scripts mk-stog, mk-stog.byte, mk-stog-ocaml-session
    to create custom stog and stog-ocaml-session
  * add: option --stog-ocaml-session to stog, to indicate the program
    used to evaluate ocaml code
  * fix META file
  * add: support for authors in the RSS feed. Thanks to Gabriel Scherer.
  * mod: use ocamlfind to compile

Release 0.6[.1]:
  * mod: do not write the config file if it already exists
  * add: --depcut option, used when getting cached elements, to use
    only one level of dependency between elements; this is useful
    for example in case the site has a menubar, leading to having
    almost all elements depending on almost all elements.
  * add: <include> now handles a depend="false" attribute, to prevent
    adding a dependency of the element on the included file
  * mod: better cache system, using dependencies of each element on other
    elements and files; also handles the stog environment used to compute
    elements in cache, so that a change in the stog environment will
    make all elements recomputed (for example when language changes)
  * add: a rule using a file or another element must add a dependency from
    the computed element to the element or file it depends on, using
    Stog_deps.add_dep
  * add: <elements> node handle reverse="false" attribute not to
    reverse order of elements (which is default, i.e. the more recent first)

Release 0.5:
  * minor fixes (thanks to Gabriel Scherer)
  * better error and warning messages (thanks to Gabriel Scherer)
  * handle prefix in all xml nodes and attributes (upgrade to Xtmpl 0.5)
  * global definitions now are of the form stog:foo
  * add: module system
  * add: new caching system, available for plugins too
  * add: Stog_plug.plugin_config_file
  * add: Stog_plug.register_level_fun_on_elt_list to register functions
    handling all elements at a time.
  * fix: add '.' after counters in section title
  * add: when a basic template is missing, create one and issue a warning;
    these templates are: page.tmpl, elt-in-list.tmpl, by-keyword.tmpl,
    by-topic.tmpl, keyword.tmpl, topic.tmpl, by-month.tmpl.

Release 0.4:
  * use separate tool to evaluate ocaml code; this allows to use native
    code version of stog even when evaluating ocaml code; also allow
    to use distinct ocaml toplevels in ocaml-eval (with session="...")
  * add simple cache system
  * new <inc> rule
  * ability to define "functions", with elt paremeters having attributes
  * sectionning now uses blocks and counters
  * handle blocks and counters (from stog_writing)
  * veritfy references to blocks by id (sections, ...) and use their title in links
  * now use "id" attribute instead of "name" attribute in sectionning tags
  * define and use levels of rules; plugins can extend the number of levels
    to define their own rewrite system
  * handle relative paths in include, when starting with . or ..

Release 0.3
  * new stage 0 to allow plugins to change the stog structure before generating
  * new fields elt_xml_doctype, elt_out
  * handle doctype attribute in element description
  * define and use stage1 and stage2 functions for plugins
  * more .mlis file and comments in the library
    