hgweb: use the given revision in the name of the archive
If you ask for an archive in hgweb by tagname the directory in the archive
should include the tagname not the changeset-id.
adding dir/bar
adding foo
dir/bar
foo
adding dir/bar_2
adding foo_2
dir/bar_2
foo_2
adding a
adding c
adding b
adding d
removing a
removing c
recording removal of a as rename to b (100% similar)