bpo-32622, bpo-35682: Fix asyncio.ProactorEventLoop.sendfile(): don't
attempt to set the result of an internal future if it's already done.

Fix asyncio _ProactorBasePipeTransport._force_close(): don't set the
result of _empty_waiter if it's already done.

This module is built by _asyncio.vcxproj and does not need to be included in pythoncore.

test.pythoninfo now logs information of all clocks, not only time.time() and
time.perf_counter().

test_asyncio/test_sendfile.py now resets the event loop policy using
tearDownModule() as done in other tests, to prevent a warning when
running tests on Windows.

Fix an assertion error in format() in debug build for floating point
formatting with "n" format, zero padding and small width. Release build is
not impacted. Patch by Karthikeyan Singaravelan.

* bpo-35660: IDLE: Remove * import from window.py

* sys was being imported through the *, so also added an import sys.

* Update 2019-01-04-19-14-29.bpo-35660.hMxI7N.rst

Anyone who wants details can check the issue, where I added the point about the sys import bug.

https://bugs.python.org/issue35631

bpo-31450: Remove documentation mentioning that subprocess's child_traceback is available with the parent process (GH-11422)

closes bpo-35643: Fix a SyntaxWarning: invalid escape sequence in Modules/_sha3/cleanup.py (GH-11411)

Revert "bpo-35603: Escape table header of make_table output that can cause potential XSS. (GH-11341)" (GH-11356)

This reverts commit 78de0119.

* bpo-35588: Implement mod and divmod operations for Fraction type by spelling out the numerator/denominator calculation, instead of instantiating and normalising Fractions along the way. This speeds up '%' and divmod() by 2-3x.

* bpo-35588: Also reimplement Fraction.__floordiv__() using integer operations to make it ~4x faster.

* Improve code formatting.
Co-Authored-By: scoder <stefan_ml@behnel.de>

* bpo-35588: Fix return type of divmod(): the result of the integer division should be an integer.

* bpo-35588: Further specialise __mod__() and inline the original helper function _flat_divmod() since it's no longer reused.

* bpo-35588: Add some tests with large numerators and/or denominators.

* bpo-35588: Use builtin "divmod()" function for implementing __divmod__() in order to simplify the implementation, even though performance results are mixed.

* Rremove accidentally added empty line.

* bpo-35588: Try to provide more informative output on test failures.

* bpo-35588: Improve wording in News entry.
Co-Authored-By: scoder <stefan_ml@behnel.de>

* Remove stray space.

_Py_HashBytes() does the check for empty string.

There is already a `Py_ssize_t i` defined at function scope that is used
for similar loops. By removing the local `int i` declaration that `i` is
used, which has the appropriate type.

Move translate_key() and constant tuples to module level.
Inline the remnant one-line function.

* Replace the docstrings cache with sys.intern().
* Improve tests.
* Unify names of tp_descr_get and tp_descr_set functions.

A minor typo in the output of `python -m test -h`.
A space was missing in between two words.
howmuch -> how much

It doesn't know the details of a few less common libc functions.

* skip test_constructor under msan.

* fix the others as well.

* reuse existing related news entry.

* typo fix

Python source code uses on several places ifdef sun or defined(sun) without the underscores, which is not standard compliant and shouldn't be used.

Defines should check for __sun instead. Reference: http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system#Solaris

https://bugs.python.org/issue35550

Also skip the same tests when using the undefined behavior sanitizer
as they much with the output.

Updates a regex in another test to use multi-line mode so that the ubsan
buildbot should pass again rather than also adding a skip to that one.

HASH_OBJ_CONSTRUCTOR has always been defined as 0 since I created
hashlib in Python 2.5.  Delete all code associated with it.

Add Clang Memory Sanitizer build instrumentation to work around
false positives from the socket and time modules as well as skipping
a couple test_faulthandler tests.

Use crypt_r() when available instead of crypt() in the crypt module.

As a nice side effect: This also avoids a memory sanitizer flake as clang msan doesn't know about crypt's internal libc allocated buffer.

`set_child_watcher()` *sets* the watcher.