Thanks batisteo for the report.

Refs #20599.

The _load_library method on BasePasswordHasher turns ImportErrors
into ValueErrors, this masks ImportErrors in the algorithm library.
Changed it to a clearer worded error message that includes
the ImportError string.

Thanks Chris Lasher for the report.

By avoiding to run syncdb with the full set of test models.

Thanks Anssi for the idea.

Fixed #20565 -- Added template examples for GCBV.

Fixed #20598 -- Add new HTTP status codes defined in rfc6585

Thanks to David Reitter for the report,
and to Marc Tamlyn and Baptiste Mispelon for the review.

The join used by select_related was incorrectly INNER when the query
had an ORed filter for nullable join that was trimmed away. Fixed this
by forcing the join type to LOUTER even when a join was trimmed away
in ORed queries.

428, 429, 431 and 511

Thanks to @DrMeers for the report and @ludwigkraatz for the initial patch.

Remove incorrect CONTENT_TYPE header from GET and HEAD requests

Refs #20532

Thanks carbonXT for the report.

Fixed order of base classes in CBV mixin docs

Older versions of uWSGI and Sentry's middleware do not adhere to
the WSGI spec and cause the `request_finished` signal to never
fire. Added notes to the appropriate places in the docs.

Fixed #20537.

Also moved its documentation to the 'advanced' section. It doesn't
belong to the 'overview'. Same for TransactionTestCase.reset_sequences.

When available_apps is set, after a TransactionTestCase, the database
is now totally empty. post_syncdb is fired at the beginning of the next
TransactionTestCase.

Refs #20483.

Simplified a formset example in the docs

Fixed #20591: added version in docs for utils.module_loading.import_by_path

This reverts commit 64041f0e.

lookup.tests.LookupTests.test_regex_non_string fails under Postgres.
We should also try to rewrite the test using an existing model.

To be able to build translated documentation, docs/locale should
be a symbolic link to the django-docs-translations/translations
directory.

Thanks josh.23.french@.

Fixed #20585: normalize signature of DeletionMixin.post.

There was an inconsistency between how the label_tag for forms were
generated depending on which method was used: as_p, as_ul and as_table
contained code to append the label_suffix where as label_tag called on a
form field directly did NOT append the label_suffix. The code for
appending the label_suffix has been moved in to the label_tag code of
the field and the HTML generation code for as_p, as_ul and as_table now
calls this code as well.

This is a backwards incompatible change because users who have added the
label_suffix manually in their templates may now get double label_suffix
characters in their forms.

Made URL patterns consistent in docs/ref/contrib/flatpages.txt