Log Message:

update to version 0.9.0

   ADDED: CVS_CHECKSUM field to pkg_src_summary. This gives a way to
   compare two pkgsrc trees by comparing their pkg_src_summaries
   comparing not only an information about package versions but also
   an information about CVS files and their revisions.

      new script added: 'cvs_checksum' that analyses local cvs
      repository and lists all files in it with their revisions and,
      optionally, calculates a checksum for all this. Run
      'cvs_checksum -h' for more information. CKSUM environment
      variable sets a checksum program, by default, standard 'cksum'.

      pkg_src_summary can generate new field: CVS_CHECKSUM, a checksum
      calculated by 'cvs_checksum' program for a package. By default 
      CVS_CHECKSUM is NOT generated.

      'pkg_cmp_summary -c' prints '!' (this means "not equal") for
      packages with the same versions but different CVS_CHECKSUM provided
      that CVS_CHECKSUM is set in both compared packages.