Fixes up minor descrepancies with cPython initial import.

(PyTypeObject, PyMethodDescr_Type, _PyMethodWrapper_Type, and
PyWrapperDescr_Type) have been modified to provide introspection
information for builtins.  Also: many additional Lib, test suite, and
Argument Clinic fixes.

Author: Larry Hastings <larry@hastings.org>

A mock created by patch with a spec as the list argument will be callable if __call__ is in the spec

Fixes issue 141