Fixed #12571 -- Attached originating WSGIRequest to test client responses.

Originating WSGIRequests are now attached to the ``wsgi_request`` attribute of
the ``HttpResponse`` returned by the testing client.

Thanks rvdrijst for the suggestion.
Fixed typo in docstrings of MonthArchiveViews.
Fixed docstring typo in django/forms/forms.py.
Deprecated importing a model before loading its application.

Refs #21719, #21680.
Removed a man page for a command that was removed