Log Message:

version -> 0.28.0

  - pkg_src_summary
      new option -i|--installed:
              generate src_summary for the installed packages only,
              do not read list of packages from stdin and
              from pkgpathN arguments

  - New tool pkg_cleanup_distdir which is actually a replacement for
    lintpkgsrc -o|-r and works much faster.

      pkg_cleanup_distdir - analyses ALLSRCFILES field of src_summary
      given on input and optionally removes files and directories in DISTDIR
      not referenced by any package.

  - pkg_grep_summary:
      new options -s and -m which make it easier for use.

  - New tool pkg_summary2bb_pkgs (needs more testing)