Release notes for ff3d746e8d8e8fbe6de287bd0f4c3a9fa23c18dc
Removed contrib.comments from translations config.
Updated formtools docs to point at new package outside the Django repo.

Refs #23677.
Adjusted a comment to reflect some app refactor changes.
Fixed #23677 -- Removed contrib.formtools
Fixed #15053 -- Improved template extending algorithm.
Updated the debug views.

Since the list of tried templates are now part of TemplateDoesNotExist,
the logic here can be much simpler. This has the nice side-effect of fixing
the template post-mortem for the egg and cached loaders.
Added deprecation warning for old loader api usage.
Catch recursion with old-style template loaders up-front.
Added documentation for the new loader api.