Thanks claudep for the patch.

Forwardport of ae1d663b
from stable/1.8.x plus more.

Refs #24324 -- Fixed Python 2 test failures when path to Django source contains non-ASCII characters.

Removed fragile algorithm to find which application a model belongs to.

Fixed #21680, #21719. Refs #21794.

Python change is http://bugs.python.org/issue22032

Added a --debug-sql option for tests and runtests.py which outputs the
SQL logger for failing tests. When combined with --verbosity=2, it also
outputs the SQL for passing tests.

Thanks to Berker, Tim, Markus, Shai, Josh and Anssi for review and
discussion.

This is useful for debugging side effects affecting tests that
are usually executed before a given test. Full suite and pair
tests sort cases more or less deterministically, thus some test
cross-dependencies are easier to reveal by reversing the order.

Thanks Preston Timmons for the review.

Thanks Bjarkias for the report.

Refs #23685.

Thanks gkoller for the report.

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.

cater for running tests from another directory than tests - applying existing pattern to newly added test_testcase_ordering as well

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

Thanks aptiko for the reporti and Tim Graham for the review.

refs #17365, #17366, #18727.

Thanks Aymeric Augustin for the report.

Refs #21188. Now pure Python DeprecationWarning visibility should
be back to Python defaults.

Thanks Piotr Kasprzyk for help with the patch.

This is the result of Christopher Medrela's 2013 Summer of Code project.

Thanks also to Preston Holmes, Tim Graham, Anssi Kääriäinen, Florian
Apolloner, and Alex Gaynor for review notes along the way.

Also: Fixes #8579, fixes #3055, fixes #19844.

This was used for python 2.6 and unittest2 compatibility. It was
forgotten when the code that used it was removed.

Added test to verify an empty label performs discovery on the current
working directory.

Thanks thepapermen for the report and Carl Meyer for the review.

It is a public API.

Reverted 4a56a93c.

First stage imports app modules. It doesn't catch import errors. This
matches the previous behavior and keeps the code simple.

Second stage import models modules. It catches import errors and retries
them after walking through the entire list once. This matches the
previous behavior and seems useful.

populate_models() is intended to be equivalent to populate(). It isn't
wired yet. That is coming in the next commit.