[1.8.x] Fixed #25767 -- Fixed data truncation possibility with Positive(Small)IntegerField on MySQL.

Backport of 710e11d0 from master

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[1.8.x] Fixed #25786 -- Fixed set_FOO_order() crash with order_with_respect_to referencing OneToOneField pk.

Partial backport of 7bec480f from master

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Thanks to Trac alias ppetrid for the report and Tim for the review.

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Otherwise we just see django.template.loader and not the "original"
callers.

Backport of ed950915 from stable/1.9.x

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NullHandler removed in 1.9; unused since Django 1.5.

Backport of b3acdeee from master

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Thanks Graham Wideman for the patch.

Backport of a80d70dd from master

Thanks Graham Wideman for the patch.

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Conflicts:
	tests/apps/tests.py
	tests/migrations/test_graph.py
	tests/queryset_pickle/tests.py
	tests/runtests.py

Backport of 1c5f4e86 from master

Conflicts:
	tests/schema/tests.py

Backport of 64240263 from master

Thanks Fako Berkers for help with the patch.

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mysqlclient 1.3.7 fixes the test failures caused by 1.3.6.

Backport of 2514e044 from master

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Thanks Josh, Anssi, and Carl for reviews and advice.

Backport of 91a431f4 from master

Instead of using DjangoJSONEncoder, use base_field's value_to_string().

Note this means the serialization of e.g. IntegerRangeField now has
strings for lower and upper, so use to_python when they came back in
(same behaviour as ArrayField, hopefully, from where I also got the
set_attributes_from_name function).

Backport of 86d9b10d and
8a842148 from master

Use the DjangoJSONEncoder so that datetime and date are encoded
appropriately.

Backport of 2926559c from master

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This is consistent with the behavior of Django 1.7.x and earlier.

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