django/django — pull request #2103 by aaugustin (2013-12-22 23:13:15+00:00)
Title: Refactored INSTALLED_APPS overrides.

* Introduced [un]set_installed_apps to handle changes to the
INSTALLED_APPS setting.
* Refactored [un]set_available_apps to share its implementation
with [un]set_installed_apps.
* Implemented a receiver to clear app-related caches. To be completed.