debug-build test_struct on a box where plain "char"
is signed.

buffer_new(). Probably fixes a bug in 'buffer("", 10, 10)' on platforms
where sizeof(Py_ssize_t) != sizeof(long) (Win64?)

Fixes:

>>> u"".center(10)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
MemoryError

on 64-bit systems.

lists and call Py_ssize_t-using helpers. All other code in this module was
already adapted to Py_ssize_t.

has been applied fairly arbitrarily in this module (nsmallest uses
Py_ssize_t, nlargest does not) and it probably deserves a more complete
review. Fixes heapq.nsmallest() always returning the empty list (on
platforms with 64-bit ssize_t/long)

EUC-CN.TXT
CP936.TXT
BIG5HKSCS.TXT
CP932.TXT
EUC-JP.TXT
SHIFTJIS.TXT
EUC-JISX0213.TXT
SHIFT_JISX0213.TXT
CP949.TXT
EUC-KR.TXT
JOHAB.TXT
BIG5.TXT
CP950.TXT
NormalizationTest-3.2.0.txt

indexable) by using the same 'for' construct as all other examples. (Also
emphasizes that reading from a random iterable is no different than reading
from a file.)

Convert Py_ssize_t using PyInt_FromSsize_t

Py_SAFE_DOWNCAST can evaluate its first argument multiple
times in a debug build.  This caused two distinct assert-
failures in test_unicode run under a debug build.  Rewrote
the code in trivial ways so that multiple evaluation of the
first argument doesn't hurt.

mixing signed and unsigned types in comparison.
Relatedly, `dataSize` is declared as DWORD, not as
int, so change relevant cast from (int) to (DWORD).

whitespace.

signed with unsigned types in comparison.

test_file to fail on Windows in reality (can't delete
a still-open file), but a new bare "except:" hid that
test_file failed on Windows, and leaving behind the
still-open TESTFN caused a cascade of bogus failures
in later tests.

So, close the file, and stop hiding failure to unlink.

* Allow the 3rd argument to generator.throw() to be None.
  The 'raise' statement does the same, and anyway it follows the
  general policy that optional arguments of built-ins should, when
  reasonable, have a default value specifiable from Python.