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.
Merge branch 'master' into schema-alteration
Fix M2M interaction with transactions
Add unique_together altering operation
Autodetection of unique_together changes
Support for index_together in schema backends
Fix combined alters on PostgreSQL
Fix some bad test running under PostgreSQL
Fix get_constraints to do multi-column indexes properly on pg
Fix index_together test
Fix "semicolon" in docs
Add AlterIndexTogether operation
Make get_constraints return columns in order
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.