This only affects the new cache api and not the deprecated get_cache.

Refs #21012

Thanks to trac user paultag for the report.

This (hopefully) ensures that the cache are created the same way as before
the offending commit.

Add missing commas in Prefetch docs

Today is not my day :(

Actually comitted the code now :þ

This was particularly problematic in the chain get_wsgi_application
-> db.connections import -> signal connection -> settings configuration.
Thanks Jon Dufresne for the report.

Thanks to tchaumeny for the patch.

Problem were users calling messages.debug/info/* with a wrong argument
and getting the error "You cannot add messages without installing
MessageMiddleware"

Thanks to trac-user merb for the report.

Fixed #20187 -- Allowed repeated iteration of HttpResponse.

All this became possible when support for old-style streaming responses was
finally removed.

Removed multiple locales separated by commas variation (that wasn't
working as documented) in favor of simply allowing use of the
``--locale``/``-l`` options more than once for ``makemessages`` and
``compilemessages``.

Thanks Romain Beylerian for the report and Claude, Simon for their help.

87502969 from stable/1.6.x.

Thanks Curtis Malony and Florian Apolloner.

Squashed commit of the following:

commit 3380495e93f5e81b80a251b03ddb0a80b17685f5
Author: Aymeric Augustin <aymeric.augustin@m4x.org>
Date:   Sat Nov 23 14:18:07 2013 +0100

    Looked up the template_fragments cache at runtime.

commit 905a74f52b24a198f802520ff06290a94dedc687
Author: Aymeric Augustin <aymeric.augustin@m4x.org>
Date:   Sat Nov 23 14:19:48 2013 +0100

    Removed all uses of create_cache.

    Refactored the cache tests significantly.

    Made it safe to override the CACHES setting.

commit 35e289fe9285feffed3c60657af9279a6a2cfccc
Author: Aymeric Augustin <aymeric.augustin@m4x.org>
Date:   Sat Nov 23 12:23:57 2013 +0100

    Removed create_cache function.

commit 8e274f747a1f1c0c0e6c37873e29067f7fa022e8
Author: Aymeric Augustin <aymeric.augustin@m4x.org>
Date:   Sat Nov 23 12:04:52 2013 +0100

    Updated docs to describe a simplified cache backend API.

commit ee7eb0f73e6d4699edcf5d357dce715224525cf6
Author: Curtis Maloney <curtis@tinbrain.net>
Date:   Sat Oct 19 09:49:24 2013 +1100

    Fixed #21012 -- Thread-local caches, like databases.

Thanks to trac user parsch for the report.

Removed information about releases < 1.7.

Thanks productions@zaziork.co.uk for the review.

Fixed #21491 -- Removed documented workaround for a known issue.

The issue was that two M2M hidden reverse managers
(related_name ending with a '+') could clash with each other.

Refs #21375 and #15932. Thanks Baptiste.

Thanks filipp for the report.

Forward-port of 1eddca0a from stable/1.6.x.

Fixed missing admindocs' site_header, refs #21293

Refs #20806. Thanks Unai Zalakain for the review.

Thanks Bouke Haarsma for the review.

Thanks guido@20tab.com for the report and Tim Graham for the
analyze.