Fixed #22826 -- Improved internal usage of Query.setup_joins.

Refs #22830. Thanks django@gfairchild.com for the suggestion.

Refs #19973.

Keeping backwards compatibility with test_runner.option_list is
tricky and would imply transforming an optparse.Option to an
argparse.Action. I choose to introduce a backwards incompatible
change because it only affects testing, not runtime behavior.

Thanks Tim Graham for the review.

and used it in the Oracle SchemaEditor. Refs #22715.

Also added a compatibility check for changed middleware defaults.

Forwardport of d94de802 from stable/1.7.x

Thanks to @gdub for the report and intial patch and
@charettes and @timgraham for the review.

Thanks chrj for the suggestion.

Thanks mrmachine for the suggestion.

Thanks cdestigter for the report.

Thanks to bendavis78 for the test and diagnostic work.

Fixed #22814 -- Allowed ISO-8601 [+-]hh timezone format in parse_datetime

Thanks Josh Parris.

An ImproperlyConfigured exception will be raised they mismatch.

Fixes a regression introduced in 5f24cf97. Refs #22635.
Thanks A.J. May for spotting the regression.

This fixes a regression on Windows introduced by b7de5f5d.

Thanks Tim Graham for the report and review.

The data migration failed on Oracle, killing the entire test suite.

Thanks timo for reporting the Oracle breakage,
and andrewgodwin for suggesting the solution.

Thanks Rahul Priyadarshi.

And moved `tablespaces` option tests to it.
The new folder can be used to test models/options, like the new option
added in refs #22778.

When using tab-completion it's easy to accidentally run a test with
a trailing slash, which causes INSTALLED_APPS to be set incorrectly.
Normalize the test labels to avoid this common error.

Thanks MattBlack for the suggestion.

Fixed #21430 -- Added a RuntimeWarning when unpickling Models and QuerySets from a different Django version.

Thanks FunkyBob for the suggestion, prasoon2211 for the initial patch,
and akaariai, loic, and charettes for helping in shaping the patch.