hgweb.cgi

This fixes a bug that Chris Mason found.  As for a test case, I can't
think of one.  It's a very weird case.  Basically, if there is a file
listed as changed in the changelog entry, but not showing up in any
of the associated manifest entries, hg would abort when trying to
create a changeset.  Now it just decides the file must not have any
versions relevant to the changeset.

#!/usr/bin/env python
#
# An example CGI script to use hgweb, edit as necessary

import cgitb, os, sys
cgitb.enable()

# sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install
from mercurial import hgweb

h = hgweb.hgweb("/path/to/repo", "repository name")
h.run()