Added {{{ContentType.objects.clear_cache()}}} which clears the lookup cache. This needs to be called at syncdb time to avoid "stale" content-type IDs after the database gets flushed during unit tests.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@4703 bcc190cf-cafb-0310-a4f2-bffc1f526a37