Replace occurence of nested comments in blake2 reference implementation
with preprocessor directive for disabling unused code.

`blake2s-load-xop.h` is conditionally pulled in only on chips with XOP
support, among others the AMD Bulldozer. The malformed comments in the
source file breaks the build of `hashlib`'s `_blake2` on GCC 6.3.0.

Official reference code on github uses `#if` so this change should be
uncontroversial.

Modify the code to use ncurses is_pad() instead of checking WINDOW
_flags field.  If your platform does not provide the is_pad(), the
existing way that checks the field will be enabled.

Note: This change does not drop support for platforms where do not
have both WINDOW _flags field and is_pad().

bpo-31910: test_create_connection() now catchs also EADDRNOTAVAIL to
fix the test on Travis CI.

Cleanup pymalloc:

* Rename _PyObject_Alloc() to pymalloc_alloc()
* Rename _PyObject_FreeImpl() to pymalloc_free()
* Rename _PyObject_Realloc() to pymalloc_realloc()
* pymalloc_alloc() and pymalloc_realloc() don't fallback on the raw
  allocator anymore, it now must be done by the caller
* Add "success" and "failed" labels to pymalloc_alloc() and
  pymalloc_free()
* pymalloc_alloc() and pymalloc_free() don't update
  num_allocated_blocks anymore: it should be done in the caller
* _PyObject_Calloc() is now responsible to fill the memory block
  allocated by pymalloc with zeros
* Simplify pymalloc_alloc() prototype
* _PyObject_Realloc() now calls _PyObject_Malloc() rather than
  calling directly pymalloc_alloc()

_PyMem_DebugRawAlloc() and _PyMem_DebugRawRealloc():

* document the layout of a memory block
* don't increase the serial number if the allocation failed
* check for integer overflow before computing the total size
* add a 'data' variable to make the code easiler to follow

test_setallocators() of _testcapimodule.c now test also the context.

Document the following functions:

* PyObject_Malloc()
* PyObject_Calloc()
* PyObject_Realloc()
* PyObject_Free()

Fix also PyMem_RawFree() documentation.

* Fix a compilation error on FreeBSD.
* Fix the data attribute size on Mac OS X.

Write the name of each subtest on a new line to help debugging when
a test does crash Python.

bpo-31897: Convert unexpected errors when read bogus binary plists into InvalidFileException. (#4171)

Removed a code that incorrectly detected in-place resizing in realloc()
 and wrote to freed memory.

* Fixed the layout of the kqueue_event structure on OpenBSD and NetBSD.
* Fixed the comparison of the kqueue_event objects.

test_curses now saves/restores signals. On FreeBSD, the curses module
sets handlers of some signals, but don't restore old handlers when
the module is deinitialized.

Update the kwarg in the documentation of `multiprocessing.pool.Pool.starmap_async`, from `error_back` to `error_callback` to match the source code..

separators that are not bytes-like objects.

Editor and output windows only see an empty last prompt line.
This simplifies the code and fixes a minor bug when newline is inserted.
Sys.ps1, if present, is read on Shell start-up, but is not set or changed.

Changes persist while IDLE remains open

Use the _PyTime_t type rather than double for the faulthandler
timeout in dump_traceback_later().

This change should fix the following Coverity warning:

CID 1420311:  Incorrect expression  (UNINTENDED_INTEGER_DIVISION)
Dividing integer expressions "9223372036854775807LL" and "1000LL",
and then converting the integer quotient to type "double". Any
remainder, or fractional part of the quotient, is ignored.

    if ((timeout * 1e6) >= (double) PY_TIMEOUT_MAX) {

The warning comes from (double)PY_TIMEOUT_MAX with:

    #define PY_TIMEOUT_MAX (PY_LLONG_MAX / 1000)

Remove dangling references to PYCC_VACPP that are not relelvant
since removal of OS/2 support.

This is a fix to the documentation to reflect the changes merged
in as part of bpo-30302.

Only declaring these as interns inside the CLI's main C module
caused build problems on some platforms (notably Cygwin), so
this switches them to a regular underscore prefixed "private" C
API declaration.

TimedRotatingFileHandler.getFilesToDelete() now sorts only when needed.

Lexically first global and nonlocal syntax errors at given scope should be detected first.

Patch by Mark Gollahon.

BytesWarning no longer emitted when the fromlist argument of
__import__() or the __all__ attribute of the module contain bytes
instances.

We stop support this OS in 2007 with commit
19fab761. Let's finish.

Add support to strptime to parse time offsets with a colon between the hour and the minutes.