I would like to have some options for printing the contents of source
packages. My initial use-case is printing the list of files present in
the debian.tar.gz/diff.gz when building packages to be sponsored. My
current method for this doesn't include the files touched by patches in
the debian/patches/ directory, but I think a whole set of options would
be nice for completeness:

      * the contents of the debian/ directory
      * the files present in the diff.gz/debian.tar.gz
      * the files touched by the diff.gz or the patches in the v3
        patches
      * the files in the upstream part of the package
      * the files in the debian and upstream parts of the package
      * the files the whole package that are in either debian or
        upstream or touched by diff.gz or the patches in the v3 patches.