Show link to /site/user/list on /site/user/lookup when User is not found.
http://code.google.com/p/soc/issues/detail?id=61
Patch by: Chen Lunpeng
Review by: Todd Larsen (with modifications)
Update some of the URL patterns to get their link_name parsing from the new
patterns in key_name.py. (Using it like this in urls.py is why key_name.py
needs to not depend on other modules...)