Fixed #22988 -- Adjusted an introspection test assertion.

Also changed test to use assertNotIn.
Fixed #22970: Incorrect dependencies for existing migrated apps
Fixed #22922: Better error message for InvalidBasesError.
Fixed #22809 -- Added model Field API reference.

Thanks to @timgraham for the review.
Fixed typo in docs/ref/contrib/gis/geos.txt.
Removed primary authors section from AUTHORS.
Fixed #13147 -- Moved User validation logic from form to model.
Fix comment
Add south upgrade note to 1.7 release notes
Added contrib.auth migration for refs #13147.
Removed docs for @permalink decorator.

It's been marked as "not recommended" since 1.6. Anyone still using it
may refer to older versions of the docs.