Fixed #28944 -- Fixed crash when chaining values()/values_list() after QuerySet.select_for_update(of=()).

Otherwise it generates invalid SQL.

Thanks Andrey Martyanov for the reporti, and Tim Graham for the review.

Fixed #28878 -- Added python_requires in setup.py and a warning for older pips that don't recognize it.

Fixed #28884 -- Fixed crash on SQLite when renaming a field in a model referenced by a ManyToManyField.

Introspected database constraints instead of relying on _meta.related_objects
to determine whether or not a table or a column is referenced on rename
operations.

This has the side effect of ignoring both db_constraint=False and virtual
fields such as GenericRelation which aren't backend by database level
constraints and thus shouldn't prevent the rename operations from being
performed in a transaction.

Regression in 095c1aaa.

Thanks Tim for the additional tests and edits, and Mariusz for the review.

The test requirement was bumped in
2514e044.

Regression in df41b5a0.

Regression in 2b09e4c8.

Fixed #28932 -- Prevented Oracle from truncating trailing zeros in the fractional part of DecimalField.

Fixes the test added in 6fd6d838.
Regression in 7c1f3901.

Fixed #28727 -- Fixed Cast crash on SQLite when casting a Python date/datetime to Date/DateTimeField.

Thanks Sergey Fedoseev for the review.

Unused since 5ca82e71.

Fixed #28915 -- Prevented SQLite from truncating trailing zeros in the fractional part of DecimalField.

This reverts commit a146b656 and adds
a test for the regression.

Regression in 58da81a5.

Refs #27985 -- Reallowed using __exact=None as an alias for __isnull=True if a custom lookup class with lookup_name != None is registered as the exact lookup.

Regression in 58da81a5 and prerequisite
for refs #28896.

Refs #28856 -- Added test for caching of a GenericForeignKey pointing to a model that uses more than one level of MTI.

Forwardport of test and release notes of
35222035 from stable/1.11.x

This required allowing WhereNode to be provided as When(condition).

This was made possible by cf12257d.