reopened on Windows.  Added tests for fallbacks.

We will keep platform.dist() and platform.linux_distribution() to make porting
from Python 2 easier.

Patch by Kumaripaba Miyurusara Athukorala.

See https://mail.python.org/pipermail/python-legal-sig/2013-November/000059.html
for details.

Patch by Antoine Pitrou.

Patch by Corey Brune.

All signal.SIG* constants may not be defined on Windows so a call like

    signal.signal(signal.SIGPIPE, lambda signum, frame: sys.exit(1))

will raise an AttributeError.

* Explain how 'error_message_format' is used by 'send_error' method
* Mention that 'responses' is used by 'send_response_only' and 'send_error' methods
* Replace 'class variables' with 'attributes'

Initial patch by Anastasia Filatova.

silently ignore keyword arguments.

Patch by Xiang Zhang.

Patch by Xavier de Gaye.

The function was only called in _sizeof_void_p()

Issue #26799: Fix python-gdb.py: don't get once C types when the Python code
is loaded, but get C types on demande. The C types can change if
python-gdb.py is loaded before the Python executable.

Patch written by Thomas Ilsche.

Issue #26805.

Issue #26801: Fix error handling in shutil.get_terminal_size(), catch
AttributeError instead of NameError. Patch written by Emanuel Barry.

test_shutil: skip the functional test using "stty size" command if
os.get_terminal_size() is missing.

Sync with upstream, see github.com/python/typing/pull/205

Issue #21668: Link audioop, _datetime, _ctypes_test modules to libm, except on
Mac OS X. Patch written by Xavier de Gaye.

link field limits for multibyte character encodings like utf-8.

Patch by Xiang Zhang.

typing.py: Consider ellipsis in TupleMeta.__eq__. By Kalle Tuure. github.com/python/typing/pull/201.

Issue #26777: Fix random failing of the test on the "AMD64 FreeBSD 9.x 3.5"
buildbot:

    File ".../Lib/test/test_asyncio/test_tasks.py", line 2398, in go
      self.assertTrue(0.09 < dt < 0.11, dt)
    AssertionError: False is not true : 0.11902812402695417

Replace "< 0.11" with "< 0.15".

Based on patch by Philipp Hagemeister.  This fixes a regression caused by
revision f4377699fd47.

Patch by Anthony Sottile.

Handle is probably meant to be excluded, and STARTUPINFO will be added to
__all__ in 3.6.

Patch by Aviv Palivoda.

Patch contributed by Luiz Poleto.