(Original patch by Mark Dickinson.)

Based on patch by Aaron Oakley

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)

 - replace 'long int' / 'long' by 'int'
 - fix capitalization of "Python" in PyLong_AsUnsignedLong
 - "is too large" -> "too large", for consistency with other messages.