Move last remaining tests out of models.py files; prep for test discovery.
Modified admindocs tests to work with unittest2 discovery.
Updated flatpages tests for unittest2 discovery.
Modified formtools to work with unittest2 discovery.
Modified messages to work with unittest2 discovery.
Modified sitemaps to work with unittest2 discovery.
Modified auth to work with unittest2 discovery.
Adjusted download_url in setup.py
Parses string literal 0 as value False when key is __isnull.
keep comments in sync with fix.
added tests for issue 20182
Merge branch 'master' of github.com:benjiec/django