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.
To run the tests, do:
cd tests/
python run-tests.py
See http://www.selenic.com/mercurial/wiki/index.cgi/WritingTests for
more information on writing tests.