[1.7.x] Fixed typo in multipartparser.py

Backport of 8a9d54aa69 from master
[1.7.x] Fixed #22628 -- Took initial forms into account when combining FormSet.min_num and FormSet.extra.
[1.7.x] Fixed #22579 -- Corrected validation for email to reject trailing slash

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

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

Backport of e7ffba8f78849fbf60b98fb8d67ef4577b585e3b from master.
[1.7.x] Fixed #22266 - quote PK before redirecting away from add_view (django.contrib.admin)

Backport of ebd70d4d00c252d5122c13906da5bddc8de0bce5 from master.
[1.7.x] Fixed #22625 -- Normalized make_aware/naive errors.

Also added tests for is/make_aware/naive.

Thanks Tom Michaelis for the report.

Backport of fa89acf from master
[1.7.x] Optimized make_aware/naive by removing redundant checks. Refs #22625.

Also added tests with pytz and removed misplaced tests.

Backport of 1109ebd from master
[1.7.x] Fixed case in form widgets docs

Backport of 9494f29d from master
[1.7.x] Fixed storing of binary fields and unicode textfields for Oracle/Python3

Backport of 6bb6df2943 from master
[1.7.x] Added stub release notes for 1.6.6.

Backport of 79e9da3d1e from master