Log Message:

Initial version of script for calculating a checksum for files and cvs tags
    from a local cvs repository. This checksum will be a part of
    pkg_src_summary. This is necessary to optionally use
    cvs files/tags in comparing source packages by distbb.

    Currently only package versions are compared by pkg_cmp_summary and
    therefore by distbb too. The problem is that packages are often updated
    without increasing PKGREVISION.