[1.0.X] Fixed #9307 -- Added the ability to pickle the Query class used by the

Oracle backend.

This allows Querysets to be cached for Oracle and should provide a model for
adding pickling support to other (external) database backends that need a
custom Query class.

Thanks to Justin Bronn for some assistance with this patch.

Backport of r9272 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9273 bcc190cf-cafb-0310-a4f2-bffc1f526a37