Refs #2333 - Modified runtests script to use new testing framework. Migrated existing tests to use Django testing framework. All the 'othertests' have been migrated into 'regressiontests', and converted into doctests/unittests, as appropriate. 


git-svn-id: http://code.djangoproject.com/svn/django/trunk@3661 bcc190cf-cafb-0310-a4f2-bffc1f526a37