[1.6.x] Fixed typo in docstrings of MonthArchiveViews.

Backport of 270c9fe488 from master
[1.6.x] Fixed docstring typo in django/forms/forms.py.

Backport of 81bb8d1220 from master
[1.6.x] Fixed #21750 -- Fixed regression introduced by 4befb30.

Validating STATIC_ROOT in StaticFilesStorage.__init__ turned out to be
problematic - especially with tests - because the storage refuses to work even
if there are no actual interactions with the file system, which is backward
incompatible.

Originally the validation happened in the StaticFilesStorage.path method, but
that didn't work as expected because the call to FileSystemStorage.__init__
replaced the empty value by a valid path. The new approach is to move back the
check to the StaticFilesStorage.path method, but ensure that the location
attribute remains None after the call to super.

Refs #21581.

Backport of 1e9e7351f8 from master
[1.6.x] Fixed a test isolation issue. Refs #17062.

This test could change settings.DATABASES['default']['TIME_ZONE'] and
didn't restore the previous value.

Backport of 1c24096f from master.
[1.6.x] Fixed #21452 -- Non-autocommit connections to PostgreSQL.

When settings.DATABASES['default']['AUTOCOMMIT'] = False, the connection
wasn't in autocommit mode but Django pretended it was.

Thanks Anssi for analysing this issue.

Refs #17062.

Backport of 1afe7488 from master
[1.6.x] Fixed a test that was failing with PostGIS.

Fixed #21452 again.
[1.6.x] Fixed typo in storage docs

Backport of 82f466b571 from master
[1.6.x] Fixed #21747 -- Added {% elif %} to template topics guide.

Thanks gcc for the suggestion.

Backport of 9e5033b302 from master
[1.6.x] Fixed #21727 -- Added some links to help clarify topics/auth/default.txt

Thanks daGrevis for the suggestion.

Backport of d35f2bfd5b from master
[1.6.x] Fixed #21768 -- Corrected TemplateView context section.

Thanks nedbatchelder for the report and claudep for the patch.

Backport of c05b2f58e7 from master
[1.6.x] Fixed #18285 -- Documented that bulk_create doesn't work with M2M relationships.

Backport of 9173d2cb74 from master
[1.6.x] Fixed #20052 -- Discouraged use of Jython given the current state of django-jython.

Thanks Josh Juneau (maintainer of django-jython) for the review.

Backport of a67e327db5 from master
[1.6.x] Fixed #13116 -- Described scope of variables created by {% url ... as var %} syntax.

Thanks leif_p for the suggestion.

Backport of 4a5aac47a6 from master
[1.6.x] Fixed #18942 -- Clarified usage of {% get_static_prefix %}.

Thanks Aymeric for the suggestion.

Backport of bc7668eb51 from master
[1.6.x] Added a note about LTS releases.

Backport of a44cbca2a5f1388c6511dad48443877fa660845a from master.
[1.6.x] Fixed #21834 -- Clarifed usage of template_name in tutorial part 4.

refs #21195 on master.
[1.6.x] Fixed #21726 -- Clarified that password should not be included in REQUIRED_FIELDS.

Thanks russellm for the report.

Backport of 6f06c749b7 from master
[1.6.x] Fixed #21529 -- Noted that {% url %} encodes its output (refs #13260).

Backport of dfc092622e from master
[1.6.x] Added a link to the 1.6 release notes which also fixed a rendering issue.

Backport of 2171341162 from master
[1.6.x] Fixed #20834 -- Described how caching of user permissions works.

Thanks Giggaflop and Jennifer Casavantes.

Backport of 5f9790072d from master