queryset-refactor: Fixed a large bag of order_by() problems.

This also picked up a small bug in some twisted select_related() handling.

Introduces a new syntax for cross-model ordering: foo__bar__baz, using field
names, instead of a strange combination of table names and field names. This
might turn out to be backwards compatible (although the old syntax leads to
bugs and is not to be recommended).

Still to come: fixes for extra() handling, since the new syntax can't handle
that and doc updates.

Things are starting to get a bit slow here, so we might eventually have to
remove ordering by many-many and other multiple-result fields, since they don't
make a lot of sense in any case. For now, it's legal.

Refs #2076, #2874, #3002 (although the admin bit doesn't work yet).


git-svn-id: http://code.djangoproject.com/svn/django/branches/queryset-refactor@6510 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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