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.

Backout 62658d9d8926 (issue #10241): it causes a crash at shutdown when deallocating a Tkapp object.

members are integers.

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.)

With old SQLite versions, _sqlite3_result_error() sets a new Python exception,
so don't restore the previous exception.

while adding the traceback, because it may call indirectly a Python function
and Python functions must not be called with an exception set.

In the case of the issue #18609, _ctypes_add_traceback() called the iso8859-1
decoder which is implemented in Python. Python has a ISO-8859-1 codec
implemented in C. It is not used because PyUnicode_Decode() only uses the C
codec for other names (aliases) of this codec ("latin-1", "latin1" and
"iso-8859-1").

when removing references to temporary build files.  This is not an elegant
solution but it does isolate changes to just build-installer.py.

We must only lower the soft limit, since lowering the hard limit makes it impossible to raise it back at the end.
(this could prevent core dumps from being generated when the test suite crashes)