[1.2.X] Converted templates doctests into unittests. We have always been at...

[1.2.X] Converted templates doctests into unittests.  We have always been at war with doctests. Backport of [14448].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14449 bcc190cf-cafb-0310-a4f2-bffc1f526a37