Updated tests for deprecation of Option.get_(add|change|delete)_permission.

refs #20642.
Fixed a couple form/formset deprecation warnings in tests.
Removed tests for django.utils.unittest vs. unittest.

Silenced warnings caused by the deprecation of django.utils.unittest.

Thanks Preston Timmons and Carl Meyer for their advice.

Fixed #20680.
This doesn't need to be a package any more.

Refs #20680.
Fixed a few more imports of django.utils.unittest.

One import per line please! Refs #20680.
Deprecated django.utils.dictconfig.

The module still exists for whoever uses it in its current state, but it
isn't imported by Django anywhere.
Reflected the new default value of LOGGING_CONFIG in docs.
Relied on NullHandler from the logging stdlib module.
Fix "semicolon" in docs
Merge pull request #1321 from bfirsh/semicolon-colon-docs

Fix "semicolon" in form docs
A couple more semicolon -> colon fixes; refs #18134.
Fixed #20691 -- Added a note for __str__() vs. __unicode__() and Python 3.

Thanks garrison for the suggestion.
Added check when fetching and updating translations from Transifex

So as syntax errors in po files don't go unnoticed. Refs #20695.
Fixed #20687 -- Added documentation for django.core.signing API.

Thanks Baptiste Mispelon for the suggestion.
Fixed #20609 -- Documented how to use request.user with RequestFactory

Thanks michel@ for the suggestion.
Fixed #20675 -- `check_password` should work when no password is specified.

The regression was introduced by 2c4fe761a. refs #20593.
Fixed #20690 -- Mentioned LOCALE_PATHS earlier in translation docs.

Thanks rene@ for the suggestion.