Fixed a test that was failing in Python 3.
The issue was that as of Python 3, the generators' `next()`
method becomes `__next()`. Thanks Alex Gaynor for noticing that.
Refs #19890.
Fixed #19908 -- Added missing import in forms.py

Thanks loic84 for the report.
Changed testing strategy used in 6b03179e.

Avoid polluting the app cache as it causes unrelated test failures.

Refs #19688.
Minor edits to some recently-added admin docs.
Remove leading underscore from a function that's all growed up now.

This function is now the de facto standard function for rendering values in a
template, and is imported by two other built-in template modules. It shouldn't
have a leading underscore.
Switching to autoescape is not a change in syntax.
Fixed #19903 -- Fixed unbalanced setUp/tearDown calls in LiveServerAddress test
Fixed #18176 -- Added test for year lookups with year < 1000

Thanks Tomas Ehrlich for the initial test
Fixed #19854 -- Turn Django's own Selenium tests off by default.
Fixed #19801 - Added brackets to input_formats.

Thanks leandron85@ for the suggestion.
Merge pull request #847 from fhahn/ticket_18176

Fixed #18176 -- Added test for year lookups with year < 1000
Use built-in fixture support rather than calling loaddata in setUp().
Fixed #18144 -- Restored compatibility with SHA1 hashes with empty salt.

Thanks dahool for the report and initial version of the patch.
Updated the release process docs to reflect the current practices.

Fixed #17919.
Fixed #6195 -- Documented caching options for javascript_catalog.
Fixed #19634 -- Added proper __hash__ methods.

Classes overriding __eq__ need a __hash__ such that equal objects have
the same hash.

Thanks akaariai for the report and regebro for the patch.
Fixed #18191 -- Don't consider Accept-Language redundantly in cache key.

Thanks to choongmin for the original patch.
Fixed a caching test on Python 3.
Updated an inaccurate comment.

Tests can run nearly as fast under PostgreSQL and MySQL as under SQLite
with a bit of configuration and the speedup is always a good thing.
Moved test_templates to templates to prevent issues with regressiontests/templates later on.