Moved boilerplate from docs to a method.

Refs #23919 -- Replaced usage of django.utils.functional.curry() with functools.partial()/partialmethod().

Unused since 3adc5f1e.

deque() isn't needed since algorithm doesn't require FIFO.

Fixed #11557 -- Added support for a list of fields in Meta.get_latest_by and QuerySet.earliest()/latest().

Fixed #28555 -- Made CharField convert whitespace-only values to the empty_value when strip is enabled.

This is a security fix.

NULL cannot be compare with standard operators on Oracle, it works only
with IS NULL and IS NOT NULL operators. Therefore 'OR ... IS NULL'
condition in NullBooleanField's check constraint is redundant.
Nullability is checked in a separate constraint.

Thanks to Marc Tamlyn for the initial patch.

All other get_*_by_name functions have errcheck=False. This makes it
return None for an invalid name instead of raising a GDALException.

And made an example use naming consistent with the rest of the doc.

Thanks leon-matthews for the report and fix.

Fixed #26344 -- Made EmailMessage include alternatives when the body is empty and it has attachments.

The test is a regression for refs #4740 to show that the original fix of
OGRIndexError is no longer needed.

This is similar to the removal of GEOSIndexError in
197b1878.

Fixed #28550 -- Restored contrib.auth's login() and logout() views' respect of positional arguments.

Regression in 78963495.

Forwardport of f8e0557b from stable/1.11.x

Unused since 197b1878.