Fixed #20735 -- clarified ManyToManyField constructor doc
Merge pull request #1350 from chrismedrela/ticket20735

Fixed #20735 -- clarified ManyToManyField constructor doc
Fixed #17528 -- Documented that add() and remove() with a many-to-many relationship do not call Model.save()
Added clarification comments to django.utils.image; refs #19934
Merge pull request #1349 from chrismedrela/ticket19934-comment

Added clarification comments to django.utils.image; refs #19934
Fixed #19031 -- Added a warning when using override_settings with 'DATABASES'
Fixed #20429 -- Added QuerySet.update_or_create

Thanks tunixman for the suggestion and Loic Bistuer for the review.
Fixed #20653 -- Renamed checksetup -> check missed in [03465639]

Thanks CollinAnderson for the report.
Fixed #20740 -- GenericIPAddressField should pass protocol to formfield()

Thanks Jeff250.
Isolated host validation tests in own test case
Fixed #20582 -- Allowed default Form.label_suffix to be translated

Thanks Tim Graham for the review.
Fixed a deprecation warning in a selenium test.
Removed obsolete sentence in queries docs
Removed Python 2.6 references in GIS docs

Refs #20746.
Fixed #20681 -- Prevented teardown_databases from attempting to tear down aliases

Thanks simonpercivall.
Fixes grammatical error in auth docs

Changes "An error will be raise if you try..." to "An error will be raised if you try..."
Merge pull request #1357 from dbinetti/patch-1

Fixed grammatical error in auth docs
Fixed #20746 -- Removed Python 2.6 specific code/docs
Fixed some markup in docs/ref/templates/api.txt
Rephrased the docs for reporting security issues to make it less intimidating.