Refs #22483

Fixed #22483 (again).

Forwardport of 5cd64296 from stable/1.7.x

Forwardport of 9bbb43dd from stable/1.7.x

See also http://blog.transifex.com/post/83622601443/new-teams-management-transifex

- Fixed bug in get_callable() that caused resolve() to put a string
  in ResolverMatch.func.
- Made ResolverMatch.url_name match the actual url name (or None).
- Updated tests that used the string value in ResolverMatch.func, and
  added regression tests for this bug.
- Corrected test urls whose dummy view paths caused failures (behavior
  that was previously masked by this bug).

Since all state is maintained on the connection at this time and none in
the atomic, it doesn't matter, but it could introduce some subtle bugs
if the implementation changed in the future.

Refs #18714. Same logic as options for makemessages commands.

cache.add() incorrectly succeeded when there was an existing key
with an infinite (None) timeout.

Refs #22451.

Regression in 8b93b314.

Thanks rcoup for the report.

Various documentation typo/spelling fixes

Errors detected by Topy (https://github.com/intgr/topy), all changes
verified by hand.

Use the stdlib's compare_digest for constant time comparisons when available

Forward ported code from 1.5 that adds backwards compatibility with legacy message length.
See commit 9e718307 for details.

Thanks to Ofir Ovadia for the initial patch.

This is a security fix; disclosure to follow shortly.

This is a security fix. Disclosure will follow shortly.

Thanks Benjamin Bach for the report and initial patch.

This is a security fix; disclosure to follow shortly.

Fixed bad code introduced in 2f9d1576.

Refs #22481.

Refs #22451.

Removed old test runner test cases.

This is useful for tests manually calling migrate inside a testcase,
for normal usage this should make no difference, since there is no
surrounding transaction after all. If there is one we still try to
leave the transaction in a useable state (for postgres at least).

If this commit turns out to be causing issues, settings savepoint=False
is probably the right fix :)

The model_inheritance_same_model_name tests couldn't be run without the
model_inheritance tests. Make the problem go away by merging them.

Thanks timo for the report.

These files were added as part of #12658, which pertained to the old django.test.simple test runner. No tests call them anymore.