Moved ServerHandler helper class to tests.

It has been only used in the builtin_servers tests since Django 1.4.
Fixed #22019 -- Added Model.objects reference documentation.
Fixed contrib.gis tests breaking in some edge cases.

The tests would error out with an ImproperlyConfigured error
if the user had psycopg installed but not geos.
Thanks to mcgohier for the report.
Fixed #22644 -- Clarified documentation for NamedUrlWizardView
Fixed #22647 -- Documented redirect_field_name keyword argument for user_passes_test.
Fixed #22626 -- Allow BinaryField defaults with SQlite.

Also fixes a slight issue in sqlite3.schema._remake_table where
default values where quoted with "column name" quoting rules.

Reference for quoting: http://www.sqlite.org/lang_expr.html

Thanks Shai Berger for the review. Refs #22424.
Fixed several flake8 errors, including one where a test wouldn't be run
Fixed #6668 -- Optimized utils.text wrap function

This fixes a failing test after applying an optimization of the
utils.text.wrap function by user SmileyChris.
Moved wordwrap test to their own function

The `wordwrap` tests were in the `test_wordcount()` method for some
reason. This moves them to their own method, and make consistent use of
double quotes where needed.
Fixed #22421 -- Regression in fixtures loading.

Loading fixtures were failing since the refactoring in 244e2b71f5 for
inheritance setups where the chain contains abstract models and the
root ancestor contains a M2M relation.

Thanks Stanislas Guerra for the report.

Refs #20946.
Fixed #22424 -- Fixed handling of default values for TextField/BinaryField on MySQL.

Thanks syphar for the review and suggestions.
Failing testcases for #22649.
Added "/" divider for DATE(TIME)_INPUT_FORMATS for Dutch locale.

Dutch ('nl-NL' and 'nl-BE') has several valid input formats;
see http://nl.wikipedia.org/wiki/Datum_(dagtekening).

Thanks Erik Romijn for review.
Refs #21230 -- removed direct settings manipulation from staticfile tests
Fixed regression from a2dd618e3b4a7472fab852da450ca5eef92a922f.
Fixed #21799 - Modified loaddata --ignorenonexistent to ignore models.
Removed some unnecessary exception naming; thanks claudep.
Fixed #22635 -- Made "It worked!" page localizable.
Merge pull request #2682 from alimony/welcome_page_local_02

Fixed #22635 -- Make "It worked!" page localizable
Updated Django makemessages process

makemessages should now automatically distribute translatable
strings in the proper locale files, for Django too
(see 50a8ab7cd1e6).