Also fix up the documentation for PyObject_GC_Resize(). It seems that since
it first got documented, the documentation was actually for
_PyObject_GC_Resize().

return type changed from int or int * to Py_ssize_t or Py_ssize_t * as this
might cause problems on 64-bit platforms.

#5834: use "failure" instead of "error" because the two have different meanings in unittest context.

documentation.

makeunicodedata.py and regenerated the Unicode database (This fixes
u'\u1d79'.lower() == '\x00').

regard to person and audience.

quit() and not close().

support.EnvironmentVarGuard objects restored the environment variables
incorrectly on __exit__.

Fix this by recording the initial value of each environment variable on the
first access in set() or unset().

now prefixed with 'Py' or '_ctypes'.