Modified the delete test to clean up after itself properly, so that the proxy_model_inheritance test can run without requiring manual confirmation.
Modified the delete test to clean up after itself properly, so that the proxy_model_inheritance test can run without requiring manual confirmation.

git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@12850 bcc190cf-cafb-0310-a4f2-bffc1f526a37

aparo/django-nonrel,aparo/django-nonrel,FlaPer87/django-nonrel,aparo/django-nonrel,FlaPer87/django-nonrel,FlaPer87/django-nonrel