Fixed #13516 -- Added an internal type definition for AutoFields, so that subclassed fields are handled correctly by the SQL generator. Thanks to manfre for the report and patch.
Fixed #13516 -- Added an internal type definition for AutoFields, so that subclassed fields are handled correctly by the SQL generator. Thanks to manfre for the report and patch.

git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@13540 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django-nonrel/django-nonrel,jamespacileo/django-france,Instagram/django,jamespacileo/django-france,mitsuhiko/django,django-nonrel/django-nonrel,alex/django-old,disqus/django-old,mitsuhiko/django,alex/django-old,disqus/django-old,skevy/django,mitsuhiko/django,skevy/django,django-nonrel/django-nonrel,Instagram/django,Instagram/django,jamespacileo/django-france,alex/django-old,skevy/django,disqus/django-old