Fix test_zinnia_trackback_on_entry_without_author on postgres
DATABASE_ENGINE instead of TEST_DATABASE_ENGINE
Fix test_zinnia_trackback on postgres
Fix test_zinnia_entry_shortlink on postgres
Fix test_comment_success on postgres
Fix test_new_category on postgres
Fix test_get_tags on postgres
Fix test_get_categories on postgres
Fix FeedsTestCase on postgres
Fix test_clustered_model on postgres
Fix test_short_url on postgres
Fix test_get_short_url on postgres
Fix MPTTModelChoiceIteratorTestCase on postgres
Fix test_get_choices on postgres
Fix AuthorListFilterTestCase.test_filter on postgres
Fix CategoryListFilterTestCase.test_filter on postgres