Forward-port of 0de21a6a from stable/1.6.x.

Required the latest version for each Python series to minimize
bookkeeping in the future.

Forward-port of c1d8f3b2 from stable/1.6.x.

In the intervening years, RelatedField has become less of a hack (though it still is one). Anyone who wants to can re-instate the comment, but please add more details.

They ensure that the attributes aren't accessed in conditions where they
don't contain a valid value.

Fixed #20666.

This was a stealth option only used by the tests, and it isn't useful
any more since `atomic` provides nested transactions.

It's unnecessary to run this on every request, since technically, settings *should be* immutable.

Thanks Claude for the heads up. Refs #12493 and commit 5e08b792.

Thanks Riley Strong for the report.

Related to 8b9b8d3b.

This code provided a deprecation path for old-style streaming responses.

Refs #6527, #7581.

Thanks reames at asymmetricventures.com for the report.

Refs #20660.

Thanks stanislas.guerra at gmail.com for the report and
Baptiste Mispelon for the review.

Removed django.contrib.auth.views.password_reset_confirm_uidb36() view to finish its accelerated deprecation schedule.

Following the series of commits removing deprecated features in
Django 1.7, here are some more unneeded imports removed and other
minor cleanups.

Thanks Gavin Wahl.

Made GeoDjango GeometryField stop accepting a 'null' keyword argument as per its deprecation in 1.5.

This includes HttpResponse and co. __init__() methods,
django.shortcuts.render_to_response() and the index(), sitemap() sitemap
app views.

refs #20642.

This is to help other ongoing branches which would benefit from
this functionality.