Fixed #21347 -- Added missing JS variable declaration.

Thanks szymon.barglowski at gmail.com for the report.
Fixed #21294 -- Clarified the logout next_page argument.

Thanks wim at go2people.nl for the report.
Fixed #21306 -- Documented lower-casing behavior of title filter.
Auto-apply initial migrations if their tables exist already.
Fixed #9722 - used pyinotify as change detection system when available

Used pyinotify (when available) to replace the "pool-every-one-second"
mechanism in `django.utils.autoreload`.

Thanks Chris Lamb and Pascal Hartig for work on the patch.
Fixed some flake8 issues
Fixed #14877 -- repeated deletion using formsets

When a formset contained deletion for an existing instance, and the
instance was already deleted, django threw an exception. A common cause for
this was resubmit of the formset.

Original patch by Trac alias olau.

In addition this commit cleaned some code in _construct_form(). This
was needed as the primary key value the user submitted wasn't converted
correctly to python value in case the primary key field was also a
related field.
Add instant autoreload on platforms supporting kqueue.
Reduce the set of events that trigger a reload.

This seems to avoid multiple reloads.
Started attackign the next flake8 violation
Fixed #21339 -- Documented removal of some form field error messages
Fixed #15529 -- More permissive geojson syntax in constructor

Thanks Wouter Klein Heerenbrink for the report.
Fixed #18508 -- tests for repeated deletion bug in ModelFormSet

The ticket's issue was already fixed by patch for #14877.
Merge branch 'master' into messages