Thanks joao at silvaneves.org for the report.

Thanks dan at dlo.me for the initial patch.

- Added __pow__ and __rpow__ to ExpressionNode
- Added oracle and mysql specific power expressions
- Added used-defined power function for sqlite

The old 'django_language' variable will still be read from in order
to migrate users. The backwards-compatability shim will be removed in
Django 1.8.

Thanks to jdunck for the report and stugots for the initial patch.

Thanks to flake8 path/to/file.py | awk -F ' ' '{ print $5 }' | sort | uniq

This shows itself with Python 3 under Windows where UTF-8 usually isn't
the default file I/O encoding and caused one failure and three errors
in our test suite under that platform setup.

When listing available management commands, only core commands are
listed if settings have any error. This commit adds a note in this
case so errors are not totally silently skipped.
Thanks Peter Davis for the report.

The typo could have consequences in exceptional cases, but I didn't
figure out a way to actually produce such a case, so not tests.

Report & patch by Michael Manfre.

The migration serializer now looks for a deconstruct method on any object.

This gives a 2x speed increase compared to the existing implementation.

Thanks to Steve Thomas for the initial patch and Tim Graham for finishing it.

The new handling allows us to do away with the whitelisting that was
required to support date and datetime objects.

Thanks Markus Holtermann for the report.

Thanks kz26 for the report and the suggested fix. Refs #19758.

Thanks bjb at credil.org for the report.

Thanks Gavin McQuillan for the report.

Fixed #21268 -- Fixed E303 pep8 warnings

This changed was reverted in 5d74853e.

Unnecessary since introduction of DiscoveryTestRunner in 9012833a.

Thanks wildfire for the report.

Thanks Raphaël Barrois for the report and the initial patch and
Aymeric Augustin for the review.