Removed ManyToManyRel.singular, which wasn't being used anymore.
Removed ManyToManyRel.singular, which wasn't being used anymore.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@2828 bcc190cf-cafb-0310-a4f2-bffc1f526a37

--HG--
extra : convert_revision : 77e1e6dd18b1e87f622e3ba3085f55c653c4684e

adieu/django-nonrel,heracek/django-nonrel,heracek/django-nonrel,adieu/django-nonrel,heracek/django-nonrel,adieu/django-nonrel