Documented jQuery upgrade

Refs #14571.
Fixed empty strings + to_field regression on Oracle

Querying the reverse side of nullable to_field relation, where both
sides can contain null values resulted in incorrect results. The reason
was not detecting '' as NULL.

Refs #17541
Fixed Oracle regression in last_executed_query() with unicode strings

The regression was likely caused by the fix in #19606 which adjusted
Oracle's unicode detection, though it seems this would have been an
issue in some configurations even before.
Skipped a test on Oracle
Marked a test as expected failure. Refs #19884
Fixed #19846 -- Optimized a dict of lists in BlockContext class

Thanks Curtis Maloney for the report and the patch.
Fixed Oracle specific failures in commands_sql tests
Fixed #19686 -- Added HTML5 number input type

Thanks Simon Charette for his help on the patch. Refs #16630.
Remove the exact Postgresql version number from gis install documentation

ref #19752
Merge pull request #749 from ecabuk/master

Fixed #19752 -- Remove the exact Postgresql version from gis doc
Method "save" in BaseModelFormSet is marked as alters_data

Fixes #17663
Merge pull request #750 from vanschelven/master

Fixed #17663 -- Marked BaseModelFormSet.save as alters_data.
Fixed #19758 -- Avoided leaking email existence through the password reset form.
Fixed #19850 -- Use configured staticfiles storage to find the URL of a static file in the admin.
Removes document_root argument from django.contrib.staticfiles.views.serve

This argument can be removed, because the new way of finding static files doesn't take document_root into account at all.
Fix #17751: Added stripping of whitespace for IPAddressField/GenericIPAddressField
Merge pull request #758 from FakoTB/master

Fixed #19572 - Remove document_root argument from staticfiles views.
Fixed #17094 - Typo in class-based views doc.

Thanks alej0 for the report.
Merge pull request #759 from erikr/master

Fix #17751: Added stripping of whitespace for IPAddressField/GenericIPAddressField
Fixed embarrassing typo in last commit.