Also, document the policy keyword that was added to Message in 3.3.

#18581: remove duplicate test and run a test class that was skipped.  Initial patch by Vajrasky Kok.

#18273: move the tests in Lib/test/json_tests to Lib/test/test_json and make them discoverable by unittest.  Patch by Zachary Ware.

Patch by Madison May.

on OS-X. Patch by Jeff Ramnani.

Thanks to Stefan Behnel for the report and proposed solution & test.

signal.getsignal returns None for some signals if faulthandler
is enabled (Patch by Jeremy Kloth)

members are integers.

getgroups(2) on OS X 10.8.  Original patch by Mateusz Lenik.

(Done as separate patch from trunk as the code has diverged quite a bit.)

    warning: 'utime.mtime_ns' may be used uninitialized in this function [-Wmaybe-uninitialized]

Patch by Sijin Joseph.