Thanks Daniele Procida.

Removed untested optional dependency on mx libraries.

These features are implemented, tracked in tickets, or not necessary.

Thanks Bruno Renié.

Thanks Dima Pravdin for the report.

Thanks sergzach for the suggestion.

Thanks Tadas Dailyda for the report and the patch.

Send post_delete signals immediately

In a normal relational construct, if you're listening for an event
that signals a child was deleted, you dont expect that the parent
was deleted already.

This change ensures that post_delete signals are fired immediately
after objects are deleted in the graph.

Thanks Daniele Procida.

Thanks Jørgen Abrahamsen.

Thanks Gabriel Hurley for the original idea
and adamv for the draft patch.

We don't make use of it currently to not break third-party db
backends.

Thanks Daniel Gerzo for the report and the initial patch.

This regression was introduced by the 'unicode_literals' patch.

Useful under Jython. Thanks Thomas Bartelmess for the report and patch.

Ref #9589.

Thanks lsaffre for the report and Chris Medrela for the initial
patch.

Fixes #12914 (again).

Thanks ingenieroariel for the suggestion and slurms for the review.

Thanks minddust for the report.

ID check is now done the same way as MultipleHiddenInput.

Thanks Sam Lai for mentioning this on the mailing list.

It was removed in Django 1.5, not deprecated.