Updated version numbers post-release.
[1.6.x] Minor edits to latest release notes.

Backport of 860d31ac7a from master
[1.6.x] Fixed typo in multipartparser.py

Backport of 8a9d54aa69 from master
[1.6.x] Fixed #22579 -- Corrected validation for email to reject trailing slash

Backport of 424fe76349a2e34eafef13c2450a7a1f4d3115a6 from master.
[1.6.x] Fixed #22622 -- Added ugettext_lazy import in docs

Backport of 7271f5db78 from master
[1.6.x] Fixed #22167 -- Improved documentation on context processors

Backport of e7ffba8f78849fbf60b98fb8d67ef4577b585e3b from master.
[1.6.x] Fixed case in form widgets docs

Backport of 9494f29d from master
[1.6.x] Added stub release notes for 1.6.6.

Backport of 79e9da3d1e from master
[1.6.x] Fixed #22644 -- Clarified documentation for NamedUrlWizardView

Backport of 727d048f0991ccbd1564c6fb225ffbfd2f1a2102 from master.
[1.6.x] Fixed #22647 -- Documented redirect_field_name keyword argument for user_passes_test.

Backport of 268670a3a4 from master
[1.6.x] Fixed #22368 -- clarified connecting to Oracle DB using service name

Used the official terminology listed in
http://docs.oracle.com/cd/B19306_01/network.102/b14212/glossary.htm#i997309

Thanks michael.cherkasov for the report.

Backport of bfac6bef83 from master
[1.6.x] Fixed #22655 -- Fixed GeoQuerySet doc about strictly_below

The paragraph was a copy of strictly_above.

Backport of 2f43229c2f from master
[1.6.x] Used link label in models FAQ to ease translation

Backport of d9d924250 from master.
[1.6.x] Fixed #22601 -- Added a note about model inheritance.

Thanks semenov for the report.

Backport of 2ea1e70b85 from master
[1.6.X] Added missing commas to list of strings
[1.6.x] Improved deprecation plan links in release notes.

Backport of 7ff326928a08d4c51141768bd305a44ca5ecb2e7 from master
[1.6.x] Fixed #22710 -- Documented aggregation behavior for empty QuerySets.

Thanks matklad for the report.

Backport of 7c6e96ec1f from master
[1.6.x] Made an aggregate test pass with spatialite backend

backends.tests.SqliteAggregationTests was failing with spatialite.

Backport of 550b6195ed from master
[1.6.x] Fixed #22753 -- Documented ability to use a note with the {% comment %} tag.

Backport of e020894470 from master
[1.6.x] Removed erroneous trailing comma in OLMapWidget.js.

Backport of c5226eb72a from master