Thanks jrothenbuhler for draft patch, Konark Modi for updates.

Removed the RIP, which seemed callous given today's news of Malcolm's death.

Documentation - Small update to SESSION_COOKIE_DOMAIN documentation

Thanks to Krzysztof Jurewicz for initial patch and
adupin for tests.

Added warn note to docs about MySQL issues with 0000-00-00 date strings

MySQL accepts 0000-00-00 as a valid date but MySQLdb converts those
values into None. So there will be problems for instance if trying to
transport the data using dumpdata/loaddata.

This patch refs #6642 that has been closed as wontfix since this is a
particular problem of MySQL.

Thanks blaze33 for the patch.

Thanks Roman Gladkov and Zbigniew Siciarz.

Thanks Kronuz and regebro.

Thanks Claude and Julien for the review.

Thanks Erik Romijn.

Fixed #20043 -- Removed unused BLANK_CHOICE_NONE

The backwards-incompatible changes section wasn't structured in sections
like it is in release notes for previous versions.

Some alternative implementations don't have them.

Closes #19944.

The AssertNumQueriesContext didn't reset connection's use_debug_cursor
in case there was an exception. This resulted in leaking query strings
into connection.queries. Maximum memory use pre-patch was around 700MB,
post-patch it is around 200MB for Django's test suite.

Fix #20058: Make compilemessages use stdout instead of stderr.

Fix #20054: Removed links to modwsgi.org.

Fix 20061: remove out of date comment.

Thanks slinkp for the report and the initial patch.

Fixed #20053 -- Fix `index_together` documentation

Fixed an erroneous import in example code of docs (class-based-views/intro).

The original problem was that when filtering two levels up in
inheritance chain, Django optimized the join generation so that the
middle model was skipped. But then Django generated joins from top
to middle to bottom for SELECT clause, and thus there was one extra
join (top->middle->bottom + top -> bottom).

This case is fixed in master as the filtering optimization is gone.
This has the side effect that in some cases there is still extra join
if the SELECT clause doesn't contain anything from middle or bottom.