newforms: Added formfield_callback argument to form_for_model and form_for_instance. The admin reworking will need this hook.
newforms: Added formfield_callback argument to form_for_model and form_for_instance. The admin reworking will need this hook.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%404387

Belgabor/django,Belgabor/django,Belgabor/django