Fixed #18761 -- Added whitespace stripping to URLField and SlugField.

Removing a backend configured in AUTHENTICATION_BACKENDS should not
raise an exception for existing sessions, but should make already
logged-in users disconnect.
Thanks Bradley Ayers for the report.

#20432: Fix for GroupAdmin test

Also, streamline the use of 0 and None between cache backends.

Fixed argument order for localized_fields to ensure backwards compatibility

Fixed #19919: get_language_from_request() disregards en-us and en

when matching Accept-Language

Thanks Stephane Benchimol for the report and the initial script and
mfandreas for the patch.

Fixed #13546 -- Easier handling of localize field options in ModelForm

Fixes #20235 - MultipleObjectMixin requires object_list in kwargs

This is so MultipleObjectMixin can be used in the same way as
SingleObjectMixin.

It can fail in hard-to-diagnose ways.

Fixed #20433: extracted catalog compilation code from view.

Made introspection always return a unicode as column name on Oracle.
Thanks aaugustin for review and suggestion to use force_text().

The failure was triggered by a cache leak.

Closes #9054. The bug itself is no longer present.

Thanks marktranchant, bmispelon, and alextreme.

Thanks srusskih for the report and Aymeric Augustin for the review.

Thanks to edevil for the report and saz for the patch.

Fix makemessage's --ignore patterns being applied to the full path
instead of the file name. Thanks to nnseva for the report and the
original patch.

Fixed some documentation on the MultiPartParser

This completes the removal of the distinction between core devs and
specialists.

Patch by Simon Meers.

This is fixing commit 4e70ad11. Thanks mattias at elements.nl
for the report and Baptiste Mispelon for identifying the faulty
commit.

Thanks Lennart Regebro for spotting that code.

Thanks Lennart Regebro for pointing it out.

refs #16319, thanks to bmispelon for the catch