Message 321776 - Python tracker

This issue discussed different things:

* test_threading was unable: I didn't see such failure the last 12 months, and I backported enhancements from master to 2.7, so I consider this issue as fixed
* documentation of threading locks: fixed
* Except on Windows, Python 2.7 uses its own implementation of TLS: this issue has been fixed in Python 3.

All discussed issues have been fixed, so I close the issue.