Models are now attached to any application they're defined in. Since
not_installed was inside app_loading, these models were mistakenly
attached to app_loading. The test that used them passed accidentally
when run after EggLoadingTest because that class' tearDown() method
replaces apps.all_models['app_loading'] by a copy of itself, while
it should remain the same as apps.app_configs['app_loading'].models.

Surprisingly, this commit doesn't change any behavior at all. When a
model is defined with the same name as another model in the same app,
the definition of the first class is bound to the name of the class
regardless of the definition of the second class.

It used to generate languages 'e' and 'n'.

Thanks rafalp for the report.

This fixes (at least according to tests on the ci itself)
admin_widgets.tests.RelatedFieldWidgetSeleniumFirefoxTests.test_foreign_key_using_to_field

(http://ci.djangoproject.com/job/Django/database=mysql_gis,python=python2.7/3792/testReport/junit/admin_widgets.tests/RelatedFieldWidgetSeleniumFirefoxTests/test_foreign_key_using_to_field/)

The cause for this issue seems to be that wait_page_loaded was executed before click fired
and as such no profile got saved (again just an educated guess, but with this fix I can no
longer reproduce it -- fingers crossed).

Changed documentation for db_type()

Thanks pydanny for the report. Also, added documentation about
base_fields attribute and its difference with fields attribute.

This reverts commit 08c9ab5a.

Many thanks go to David Burns (@AutomatedTester) for helping me understand
css selectors and pointing me towards the correct selenium methods.

The app/apps dichotomy was more confusing than valuable.

Thanks Stephen McDonald for the suggestion.

Fixed minor typos in GEOS API doc page.

In get_commands, setup() might already have been called, for example
when the management command is called through call_command. Moving
setup() to ManagementUtility so as it is only called when the command
is run from command line.

Fixed typos. Changed grammar.

Minor typos. Some grammar changes.

Thanks to Loic for the report.

When django.setup() (and then configure_logging) is called inside
catch_warnings, logging setup is negatively affected (notably
warnings.showwarning definition).

Django determines automatically which application models belong to,
provided the application can be imported without importing models.

Refs #21018, #21688.

Refs #12288, #21679.

This was used for python 2.6 and unittest2 compatibility. It was
forgotten when the code that used it was removed.

Added test to verify an empty label performs discovery on the current
working directory.