Issue #24952: Merge 3.5 into 3.6

diff --cc Misc/ACKS
Simple merge

diff --cc Misc/NEWS
index 9b455ab69daa2f1dbf4d3df84d328716c206486c,7ff67bf161712fc80fe67fd35e548efedef8b47c..38f31e4880476af81876e5bb1370495da96a556a
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -2,71 -2,6 +2,74 @@@
  Python News
  +++++++++++
  
 +What's New in Python 3.6.0 alpha 1?
 +===================================
 +
 +Release date: XXXX-XX-XX
 +
 +Core and Builtins
 +-----------------
 +
 +- Issue #9232: Modify Python's grammar to allow trailing commas in the
 +  argument list of a function declaration.  For example, "def f(*, a =
 +  3,): pass" is now legal. Patch from Mark Dickinson.
 +
 +Library
 +-------
 +
 +- Issue #23552: Timeit now warns when there is substantial (4x) variance
 +  between best and worst times. Patch from Serhiy Storchaka.
 +
 +- Issue #24633: site-packages/README -> README.txt.
 +
 +- Issue #24879:  help() and pydoc can now list named tuple fields in the
 +  order they were defined rather than alphabetically.  The ordering is
 +  determined by the _fields attribute if present.
 +
 +- Issue #24874:  Improve speed of itertools.cycle() and make its
 +  pickle more compact.
 +
 +- Fix crash in itertools.cycle.__setstate__() when the first argument wasn't
 +  a list.
 +
 +- Issue #20059: urllib.parse raises ValueError on all invalid ports.
 +  Patch by Martin Panter.
 +
 +- Issue #24360: Improve __repr__ of argparse.Namespace() for invalid
 +  identifiers.  Patch by Matthias Bussonnier.
 +
 +- Issue #23426: run_setup was broken in distutils.
 +  Patch from Alexander Belopolsky.
 +
 +- Issue #13938: 2to3 converts StringTypes to a tuple. Patch from Mark Hammond.
 +
 +- Issue #2091: open() accepted a 'U' mode string containing '+', but 'U' can
 +  only be used with 'r'. Patch from Jeff Balogh and John O'Connor.
 +
 +- Issue #8585: improved tests for zipimporter2. Patch from Mark Lawrence.
 +
 +- Issue #18622: unittest.mock.mock_open().reset_mock would recurse infinitely.
 +  Patch from Nicola Palumbo and Laurent De Buyst.
 +
 +- Issue #24426: Fast searching optimization in regular expressions now works
 +  for patterns that starts with capturing groups.  Fast searching optimization
 +  now can't be disabled at compile time.
 +
 +- Issue #23661: unittest.mock side_effects can now be exceptions again. This
 +  was a regression vs Python 3.4. Patch from Ignacio Rossi
 +
 +- Issue #13248: Remove deprecated inspect.getargspec and inspect.getmoduleinfo
 +  functions.
 +
 +Documentation
 +-------------
 +
++- Issue #24952: Clarify the default size argument of stack_size() in
++  the "threading" and "_thread" modules. Patch from Mattip.
++
 +Tests
 +-----
 +
  
  What's New in Python 3.5.1
  ==========================