Trying to move most of the introductory example stuff up to the top and
pushing the reference bits further down.

Thanks Malcolm Tredinnick for the review.

Remove unused imports in tutorial 4. refs #18915

Updated text in tutorial 3 regarding removing unused import; refs #18915

Thanks kmike.

Closes #17452.

Fixed #12397 -- allow safe_join to work with the root file system path, which means you can have your root template or file upload path at this location. You almost certainly don't want to do this, except in *very* limited sandboxed situations.

After submitting ticket #18915, I noticed 2 additional occurrences of the issue. 

Removed many uses of bare "except:", which were either going to a) silence real issues, or b) were impossible to hit.

Ticket #17324 - Improve security docs with better CSRF explanation

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