Avoids failures on Windows. Refs #8918.

This config allows a clean run of flake8. Some of the ignored
codes will be remove over time as we clean things up.

Thanks Marc Tamlyn for the suggestion.

Thanks Keryn Knight for the report.

The ModelForm docs suggested that fields defined declaratively override
default fields generated from the form Meta.

This is conceptually wrong, especially with inheritance in mind. Meta is
usually defined on the topmost ModelForm subclass, while fields can come
from anywhere in the MRO, especially base classes; therefore we suggested
that something defined in a base class override something from a subclass.

This patch rephrases the docs around the idea that Meta is used to generate
*missing* fields.

Refs #8620, #19617.

Thanks @mjtamlyn and @timgraham for the review.

Thanks gergely at polonkai.eu for the suggestion.

Fixed #18866 -- added validation error for verbose_name longer than 39 characters

Added a validation error check when creating the permissions for model, to avoid
cryptic database error when the verbose_name is longer than 39 characters
thanks elena for reporting it

Thanks Aymeric Augustin for the report and the documentation and
Tim Graham for the review.

Without those imports, affected test files cannot be run
independently. Refs #21164.

Thanks jpic for the report and chmodas for working on a patch.

Reverts 2ea80b94. Refs #19362.

Thanks gcc for the report and vajrasky for the patch.

Thanks Marc Tamlyn for the review.

Thanks slinkp for the suggestion.

Added ``--natural-foreign`` and ``--natural-primary`` options and
deprecated the ``--natural`` option to the ``dumpdata`` management
command.

Added ``use_natural_foreign_keys`` and ``use_natural_primary_keys``
arguments and deprecated the ``use_natural_keys`` argument to
``django.core.serializers.Serializer.serialize()``.

Thanks SmileyChris for the suggestion.

Thanks leahculver for the suggestion and dc and vajrasky for work
on the patch.

* Removed trailing whitespace.
* Added newline to EOF if missing.
* Removed blank lines at EOF.
* Removed some stray tabs.

refs #4459.

Fixed #21222 - Documented that 'default' and 'other' must be different databases when running tests.

Thanks vernondcole for the suggestion.

The wrong exception was being caught when detecting the presence of GeoIP.
Thanks to ramiro for the report.

Thanks to vajrasky for the report and patch.

Fix grammatical errors in email documentation