Fixed a F811 warning introduced by 35db9d58d6.
Fixed #21345: Don't evaluate callable settings in the debug page.

Thanks to crass for the report.
Added some more tests for the debug page.

* Missing tests for ticket #12744
* Tests for the cleanse_setting feature (leaving out sensitive
  settings from the debug page)
Documented removal of django.core.servers.basehttp.WSGIServerException

refs 2ca00faa913754cd5860f6e1f23c8da2529c691a
Fixed #21316 -- Documented that modifying safe strings makes them unsafe.

Thanks dev@simon.net.nz for the suggestion and vijay_shanker for the patch.
Documented the limitation on sep argument to Signer

Co-Authored-By: Gavin Wahl <gwahl@fusionbox.com>
Fixed #20610: Added a message level dict to contrib.message context processor.
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