Added getvalue() to HttpResponse to return the content of the response,
along with a few other methods to partially match io.IOBase.

Thanks Claude Paroz for the suggestion and Nick Sanford for review.

Fixed issue with warning message displayed for unbound naive datetime
objects when USE_TZ is True. Adds unit test that demonstrates the issue
(discoverable when using a custom lookup in MySQL).

Fixed #23376 -- Make documentation about required Storage methods consistent.

consistent.

The following methods **should** be implemented, but are not required:

 * Storage.delete()
 * Storage.exists()
 * Storage.listdir()
 * Storage.size()
 * Storage.url()

Updated documentation to reflect this fact and give a couple of examples
where some methods may not be implemented. Add a warning that not
implementing some methods will result in a partial (possibly broken)
interface.

Ticket: https://code.djangoproject.com/ticket/23376

Thanks djbug for the report.

Thanks raratiru for the report and Claude Paroz for review.

If settings.FIXTURE_DIRS contains duplicates or a default fixture
directory (app_name/fixtures), ImproperlyConfigured is raised.

Thanks to Berker Peksag and Tim Graham for review.

Thanks Doug Goldstein for the suggestion.

Thanks Daniele Procida for the report and review.

Thanks Thomas Chaumeny for the initial patch.

Thanks to Andrey Antukh for the report.

Thanks to 57even for the report.

Thanks kostko for the report.

Thanks Tim Graham for the review.

Thanks Aymeric Augustin for the report.

Thanks Aymeric Augustin for the report.

Thanks Aymeric Augustin for the report.

Thanks Aymeric Augustin for the suggestion.

Thanks Doug Goldstein for the initial patch.

The following are recognized as ending a line: the Unix end-of-line
convention '\n', the Windows convention '\r\n', and the old
Macintosh convention '\r'.

http://www.python.org/dev/peps/pep-0278

Thanks tchaumeny for review.

Thanks claudp for the suggestion and review.

Fixed #23556 -- Raise a more meaningful error message when migrations refer to an unavailable node