[1.4.x] Fixed #19196 -- Added test/requirements

Backport of 4d92a0bd86 from master
[1.4.x] Fixed #20730 -- Fixed "Programmatically creating permissions" error.

Thanks glarrain for the report.

Backport of 684a606a4e from master
[1.4.x] Fixed #20756 -- Typo in uWSGI docs.

Backport of a3242dc9fe from master
[1.4.x] Atom specification URL updated

Changed to the URL of the official RFC for Atom, since Atomenabled.org
is just a holding page.

Backport of beefc97171 from master
[1.4.x] Fixed #20792 -- Corrected DISALLOWED_USER_AGENTS docs.

Thanks simonb for the report.

Backport of dab52d99fc from master
[1.4.x] Fixed #18315 -- Documented QueryDict.popitem and QueryDict.pop

Thanks gcbirzan for the report.

Backport of 8c9240222f from master
[1.4.x] Fixed #20779 -- Documented AdminSite.app_index_template; refs #8498.

Thanks CollinAnderson for the report.

Backport of 7de35a9ef3 from master
[1.4.x] Added a bugfix in docutils 0.11 -- docs will now build properly.

Backport of a3a59a3197 from master
[1.4.x] Added missing release notes for older versions of Django

Backport of 3f6cc33cff from master
Fixed is_safe_url() to reject URLs that use a scheme other than HTTP/S.

This is a security fix; disclosure to follow shortly.
Bumped version numbers for 1.4.6.
Added 1.4.6/1.5.2 release notes.
Stole the Makefile for building packages from master.
[1.4.x] Removed 1.5.2 release notes
Bump version post-release.
Fixed regression in validation tests since example.com is available via https now.
[1.4.x] Fixed #20905 -- Fixed an Oracle-specific test case failure

Made a test checking ORM-generated query string case-insensitive.

Backport of ee0a7c741e from master
[1.4.x] Fixed #20906 -- Fixed a dependence on set-ordering in tests

Backport of 1ae64e96c1 from master
[1.4.x] Fixed #20904: Test failure on Oracle
Just skip the failing test, the failure isn't really relevant; also,
both the test and the reason for its failure were removed in 1.5.

Thanks Tim Graham for advice on 1.5.
[1.4.x] Fixed #20907 - Test failure on Oracle

Backport of the Oracle-specific part of commit a18e43c5bb8cb7c82
from master. This commit made get_indexes more consistent across
backends.

Thanks Tim Graham for pointer to the commit, akaariai and ikelly
for the original commit.