Fixed #15624 -- Made sure aggregations are present in SELECT
Added a bugfix in docutils 0.11 -- docs will now build properly.
Fixed #20826 -- Moved Manager.raw() and Manager._insert() to the QuerySet class.
Fixed #19987 -- Disabled host validation when DEBUG=True.

The documentation promises that host validation is disabled when
DEBUG=True, that all hostnames are accepted. Domains not compliant with
RFC 1034/1035 were however being validated, this validation has now been
removed when DEBUG=True.

Additionally, when DEBUG=False a more detailed SuspiciousOperation
exception message is provided when host validation fails because the
hostname is not RFC 1034/1035 compliant.
Fixed #12103 -- Added AuthenticationForm.confirm_login_allowed to allow customizing the logic policy.

Thanks ejucovy and lasko for work on the patch.
Fixed #20649 -- Allowed blank field display to be defined in the initial list of choices.
Removed unused model option "admin"
Fixed #20667 - Removed discussion of DEBUG from tutorial.

Forward-port of 3493f18d78 from master.
Fixed #17519 -- Fixed missing SQL constraints to proxy models.

Thanks thibaultj for the report, jenh for the patch,
and charettes for the tests.
Fixed #18777 -- Localized form fields with as_text/as_hidden

Thanks croldan for the report.
Fixed #20838 -- Fixed Geodjango spatialrefsys test failure with postgis-2.0.3
Fixed #20786 -- Cleaned up docs/ref/exceptions.txt

Thanks Daniele Procida for the suggestion and edits.
Fixed #18681 -- GenericInlineModelAdmin.get_formset() no longer bypasses get_fieldsets().

Refs 23e1b59 which already fixed this issue for ModelAdmin and InlineModelAdmin.
Fixed LogEntry.get_admin_url() for non-existent models.

Regression introduced by [369b6fa]; refs #18169.
Fixed #18923 -- Corrected usage of sensitive_post_parameters in contrib.auth

Thanks Collin Anderson for the report.
Added missing request argument to example in URL dispatcher docs
Added ModelAdmin.get_search_fields.
Fixed #20822 -- Set content type of default error pages to 'text/html'.

Thanks Jimmy Song for the patch.
Fixed #20858 -- Removed erroneous import in tutorial 2.

Thanks AtomicSpark.
Moved get_search_results from BaseModelAdmin to ModelAdmin.

Refs #15961.