The tests now run correctly with the new psycopg2 backend. There's 4...

The tests now run correctly with the new psycopg2 backend.  There's 4 failures, but they all have to do with the new way the psycopg2 handles datetimes and are probably a single fix.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@2940 bcc190cf-cafb-0310-a4f2-bffc1f526a37