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Ok, v3 includes the additions to the threading module, tests
in both test_thread and test_threading and docs in both
thread and threading modules (duplicated as I don't know how
to do the LaTex linking).

If there are no other issues needing to be addressed, I
propose to check these changes in sometime on the weekend of
June 3-4 or thereabouts to get in a bit before the beta release.