Supersedes https://github.com/python/cpython/pull/2490

More consistent with how other parts of Python find the filename (e.g. tracebacks and pdb).

This solves a regression in logging config due to changes in BPO-23835.

- bugfix and test for fragile metavar handling in argparse (see
  bpo-24089, bpo-14046, bpo-25058, bpo-11874)
- also fixes some incorrect tests that did not make 1-element tuples correctly

_feed_data_to_bufferred_proto() renamed to
_feed_data_to_buffered_proto() ("bufferred" => "buffered").

Typo spotted by Nathaniel J. Smith.

If tests are re-run, use "xxx then yyy" result format (ex: "FAILURE
then SUCCESS") to show that some failing tests have been re-run.

Add also test_regrtest.test_rerun_fail() test.

The test does crash on multiple CIs causing many troubles. For
example, the test prevents to get results of the two Refleak 3.x
buildbots.

The cancellation of an overlapped WSARecv() has a race condition
which causes data loss because of the current implementation of
proactor in asyncio.

No longer cancel overlapped WSARecv() in _ProactorReadPipeTransport
to work around the race condition.

Remove the optimized recv_into() implementation to get simple
implementation of pause_reading() using the single _pending_data
attribute.

Move _feed_data_to_bufferred_proto() to protocols.py.

Remove set_protocol() method which became useless.

A few wording improvements to dict ordering documentation.

Followup to 4705ea38 and bpo-33778.

* bpo-33274: Compliance with DOM L1: return removed attribute

* Update 2018-06-06-22-01-33.bpo-33274.teYqv8.rst

Also, standardize indentation of generated tables.

Fix "<CoroWrapper ...> was never yielded from" warning in
PyTask_PyFuture_Tests.test_error_in_call_soon() of
test_asyncio.test_tasks.

Close manually the coroutine on error.

Hide PendingDeprecationWarning in test__register_task_3().

* Close sockets and streams to fix ResourceWarning warnings
* Catch also OSError to hide a traceback on an expected handshake
  error

Document that the default value of repeat changed from 3 to 5 in
Python 3.7.

Substract one because listdir() opens internally a file
descriptor to list the content of the /proc/self/fd/ directory.

Add test_support.test_fd_count().

Move also MAXFD code before msvcrt.CrtSetReportMode(), to make sure
that the report mode is always restored on failure.

Move the floor() call into fbound() to call floor() on a double
rather than an int. The change should enhance the rounding.

Document also (int)double rounding mode.

an => and

The bug has been fixed 10 months ago:

* https://svnweb.freebsd.org/base?view=revision&revision=321920
* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221048