Fixed #5177 -- Changed content type creation to also remove the types for any...

Fixed #5177 -- Changed content type creation to also remove the types for any orphaned entries (so it's now an "update" feature). Thanks, Rob Hudson.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@6287 bcc190cf-cafb-0310-a4f2-bffc1f526a37