clarify clean_<field> docs, ticket #18917

Fixed #17888 -- no longer silence exceptions inside of check_test. Thanks to brutasse for the patch.

Previous this used Python's builtin hash() function, which has never been guarnteed to be stable across implementations (CPython/Jython/etc.) or 32/64 bitness. However, this in practice it was stable. However, with the impending release of Python 3.3 hash randomizations is enabled by default, which would mean the index name changed between program invocations.

remove unused import in decoupling URLs tutorial, closes #18915

that will be available as of version 1.4.2.

The `include` function isn't used in polls/urls.py.

specify any orderable field can be specified in get_latest_by, closes #18875

Even after repeated adjustment of the constants, this test still fails
randomly. It has educated us to ignore messages from Jenkins, to a
point where we missed some actual failures. In addition, it accounts
for a non-negligible percentage of the run time of the test suite
just by itself. Since no one has proposed a convincing patch in months,
I'm going to remove the patch. We can't keep a randomly failing test
forever.

Small doc change: clarify day and month

Fixed #18905 - Updated URL for Django People

Thanks Aymeric Augustin for the report and the initial patch.

Clarify some of the password reset docs

Thanks milosu for the report and the initial patch.

Fixed #18840 - Added a mentioned of the upload_to parameter to the ModelForm example in file uploads.

Unlike other model fields, the newly introduced (1.4)
GenericIPAddressField did not accept verbose_name and name as the
first positional arguments. This commit fixes it.
Thanks Dan McGee for the report and the patch.

Thanks Preston Holmes for the patch.

Thanks chromano for the draft patch.

Thanks Idan Gazit for the patch.

Fixed #18642 - Added a note suggesting the use of render() rather than render_to_response() if you need RequestContext in your template.

Some of the wording was copied from the change password section. Updated
the text to clarify that the we are talking about password resets.

Fixed #16309 - Made ModelAdmin.list_filter versionchanged annotations more specific to the sections that changed; thanks akaihola for the suggestion and patch.