Version-Log and New-Version-Log attributes

Version-Log string-constant	Attribute
New-Version-Log string-constant	Attribute

The version log is stored with the descriptor of each version of a project. A prcs checkin initializes it from the New-Version-Log attribute, removing any existing Version-Log attribute, and setting the New-Version-Log to the empty string. The version log is intended to describe the changes made in this version from its predecessor, or to contain other comments about it.

For example,

     (Version-Log "Added header.h")
     (New-Version-Log "Modified main.c")