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.

testcleanup directive is new as of 1.1, and we are currently running
1.0.7.  But using testsetup works just as well, and avoids the
unknown directive error when building the docs.

'SHA1' instead of 'SHA'.

With the exception of the 'as_string' call in the policy docs.
That one is a separate issue.

Note that when building the docs sphinx is complaining about
.. testcleanup:: being an invalid directive.  I don't know
why this is, as I'm following the sphinx docs...but fortunately
the action is to omit the text in the body, so the generated
documentation is correct.

With help from jkloth on IRC, so it will hopefully work
this time :)