Fix also return type for few other functions (clear, releasebuffer).

Partically revert commit c2e1607a to
fix a reference leak.

"make tags" and "make TAGS" now also parse Include/cpython/ header
files.

'data' argument of unicode_fill() is modified, so it must not be
constant.

Add more assertions to unicode_fill(): check the maximum character
value.

Fix mktime() overflow error in test_email: run
test_localtime_daylight_true_dst_true() and
test_localtime_daylight_false_dst_true() with a specific timezone.

Fix invalid function cast warnings with gcc 8
for method conventions different from METH_NOARGS, METH_O and
METH_VARARGS excluding Argument Clinic generated code.

Fix invalid function cast warnings with gcc 8
for method conventions different from METH_NOARGS, METH_O and
METH_VARARGS in Argument Clinic generated code.

The lineno and col_offset attributes of AST nodes for list comprehensions,
generator expressions and tuples are now point to the opening parenthesis or
square brace. For tuples without parenthesis they point to the position
of the first item.

test_reduce_ex() in test_array.py and
test_reversevaluesiterator_pickling() in test_dict.py weren't using
the highest pickle protocol.

Move pystate.h code surrounded by "#ifndef Py_LIMITED_API"
to a new Include/cpython/pystate.h header file.

* Move dictobject.h code surrounded by "#ifndef Py_LIMITED_API"
  to a new Include/cpython/dictobject.h header file.
* Add PyAPI_FUNC() to _PyDictView_New().
* Reorganize dictobject.h: move views and iterators at the end.

Move pylifecycle.h code surrounded by "#ifndef Py_LIMITED_API"
to a new Include/cpython/pylifecycle.h header file.

Move abstract.h code surrounded by "#ifndef Py_LIMITED_API"
to a new Include/cpython/abstract.h header file.

Regression introduced in e3ce6952 and 25b804a9, where the old parameter
update_tryorder to _synthesize was first ignored, then given the opposite
value in the attempt to fix bpo-31014.

Move pyerrors.h code surrounded by "#ifndef Py_LIMITED_API"
to a new Include/cpython/pyerrors.h header file.

Tolerate up to 30 ms, instead of 15 min, in other threads.

Move unicodeobject.h code surrounded by "#ifndef Py_LIMITED_API"
to a new Include/cpython/unicodeobject.h header file.

* Move object.h code surrounded by "#ifndef Py_LIMITED_API"
  to a new Include/cpython/object.h header file.
* "typedef struct _typeobject PyTypeObject;" is now always defined
  in object.h, but if Py_LIMITED_API is not defined,
  Include/cpython/object.h also defines the structure.
* Complete the printfunc comment to mention Py_LIMITED_API define.

Log TZ to debug a timezone issue... and a few more :-)

Fix str.format(), float.__format__() and complex.__format__() methods
for non-ASCII decimal point when using the "n" formatter.

Changes:

* Rewrite _PyUnicode_InsertThousandsGrouping(): it now requires
  a _PyUnicodeWriter object for the buffer and a Python str object
  for digits.
* Rename FILL() macro to unicode_fill(), convert it to static inline function,
  add "assert(0 <= start);" and rework its code.

Add "assert(PyTuple_Check(op));" to _PyTuple_CAST() to check that the
argument is a tuple object in debug mode.

PyTuple_GET_SIZE() now uses _PyTuple_CAST() to get its assertion.

There are some same consts in a module.  This commit merges them into
single instance.  It reduces number of objects in memory after loading modules.


https://bugs.python.org/issue34100

* Remove an unused import.
* Move get_expected_config() call to check_config() to ease backport
  to Python 3.7.

test_embed.InitConfigTests now gets the expected configuration from
a child process run with -S to not run the site module.

https://bugs.python.org/issue35300

Move _PyTuple_ITEMS() to a new header file:
Include/internal/pycore_tupleobject.h

Importing ProcessPoolExecutor may hang or cause an error when the import
accesses urandom on a low resource platform


https://bugs.python.org/issue29877

The "-I" command line option (run Python in isolated mode) is now
also copied by the multiprocessing and distutils modules when
spawning child processes. Previously, only -E and -s options (enabled
by -I) were copied.

subprocess._args_from_interpreter_flags() now copies the -I flag.

Include/*.h should be the "portable Python API", whereas
Include/cpython/*.h should be the "CPython API": CPython
implementation details.

Changes:

* Create Include/cpython/ subdirectory
* "make install" now creates $prefix/include/cpython and copy
  Include/cpython/* to $prefix/include/cpython
* Create Include/cpython/objimpl.h: move objimpl.h code
  surrounded by "#ifndef Py_LIMITED_API" to cpython/objimpl.h.
* objimpl.h now includes cpython/objimpl.h
* Windows installer (MSI) now also install Include/ subdirectories:
  Include/cpython/ and Include/internal/.