queryset-refactor: Converted the queryset iterator to be a real iterator and

only populate the result cache on demand. We actually populate the result cache
100 elements at a time, rather than one at a time for efficiency, but this is a
real win when the resultset contains 10,000 objects for example.

This also provides an efficient boolean (__nonzero__) test that doesn't use up
a lot of memory if you don't read all the results.

Refs #2430, #5987.


git-svn-id: http://code.djangoproject.com/svn/django/branches/queryset-refactor@7030 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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