-Tag rename unfinished business
-(things resulting from searching for `tag' where searching for
- `debiantag' wouldn't find them)
-
- - protocol version 4
- implies ability to sign new tag (this is already there
- so simply advertising version 4 will work)
- needs also new ability to sign old-format tag in split
- brain way
-
- - many actual tests
-
- - other tag should be [dgit Maintainer-Tag quilt=$quilt-mode]