Thanks Simon Charette and Claude Paroz for the reviews.

AUTOINCREMENT is dropped converting an AutoField to IntegerField
which isn't the point of this test. MySQL would warn or error about
this.

default_storage_engine was introduced in MySQL 5.5.3.
storage_engine was removed in MySQL 5.7.5.

`action="."` strips query parameters from the URL which is not usually what
you want. Copy-paste coding of these examples could lead to difficult to
track down bugs or even data loss if the query parameter was meant to alter
the scope of a form's POST request.

If SQLITE_MAX_VARIABLE_NUMBER (default = 999) is changed at compile time
to be greater than SQLITE_MAX_COLUMN (default = 2000), which Debian does
by setting the former to 250000, Django raised an exception on queries
containing more than 2000 parameters when DEBUG = True.

Before cf546e11, static files in form or widget Media were usually
wrapped with contrib.staticfiles.templatetags.staticfiles.static.
This test ensures compatibility with third-party code that's still
using this pattern.

This uses a translation string that already exists (used in the
<title> of the same page) and fixes a grammer mistake for German
and possibly other languages.

Also documented missing short command line options to fix #24134. This bumps
the minimum sphinx version required to build the docs to 1.3.4.

Thanks Simon Charette for review.

Thanks Thomas Güttler for the suggestion.

Forwardport of 5b3c66d8 from stable/1.8.x

Thanks to Karl Hobley for the report and Markus, Shai, Aymeric for their input
and Tim for the review.