[1.3.X] Fixed #16758 - Added a warning regarding overriding default settings; thanks cyclops for the suggestion & Aymeric Augustin for the patch.
[1.3.X] Fixed #16758 - Added a warning regarding overriding default settings; thanks cyclops for the suggestion & Aymeric Augustin for the patch.

Backport of r17566 from trunk.

git-svn-id: 6bee183d120e8e569924b918ee6c564bbb314a32@17567 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django-nonrel/django-nonrel,django-nonrel/django-nonrel,django-nonrel/django-nonrel