* make CallTip and ToolTip sub-classes of a common abstract base class
* remove ListboxToolTip (unused and ugly)
* greatly increase test coverage
* tested on Windows, Linux and macOS

bpo-34170, bpo-34326: Fix pymain_run_file(): use
PyRun_AnyFileExFlags(closeit=1) instead of calling fclose(fp)
explicitly to close the input file before running the code.

If coerce_c_locale is already set (>= 0), use its value: don't
override it.

When the filesystem doesn't support files with large timestamps,
skip testing that such files can be zipped.

sys_setcheckinterval() now uses a local variable to parse arguments,
before writing into interp->check_interval.

Remove unnecessary "that" in the sentence.

Some MacOS-tk combinations need .update_idletasks().
The call is both unneeded and innocuous on Linux and Windows.
Patch by Kevin Waltzer.

Rephrase it to "It raises a `ValueError`"

Multiprocessing test_timeout() now accepts a delta of 100 ms instead
of just 50 ms, since the test failed with 135.8 ms instead of the
expected 200 ms.

* Inline pymain_run_file() and pymain_open_filename() into
  pymain_run_filename()
* Created pymain_run_stdin() which is pymain_run_filename() with
  filename=NULL
* Rename pymain_run_filename() to pymain_run_file()

In the documentation for the traceback module, the definitions of functions
extract_tb(), format_list() and classmethod StackSummary.from_list()
mention the old style 4-tuples that these functions used to return or accept.

Since Python 3.5, however, they return or accept a FrameSummary object
instead of a 4-tuple, or a StackSummary object instead of a list of 4-tuples.
Co-Authored-By: Berker Peksag <berker.peksag@gmail.com>

ZipFile can zip files older than 1980-01-01 and newer than 2107-12-31 using
a new strict_timestamps parameter at the cost of setting the timestamp
to the limit.

Added missing .grab_release() calls to all places where we call .grab_set().

bpo-31650, bpo-34170: Replace _Py_CheckHashBasedPycsMode with
_PyCoreConfig._check_hash_pycs_mode. Modify PyInit__imp() and
zipimport to get the parameter from the current interpreter core
configuration.

Remove Include/internal/import.h file.

* Add Include/coreconfig.h
* Move config_*() and _PyCoreConfig_*() functions from Modules/main.c
  to a new Python/coreconfig.c file.
* Inline _Py_ReadHashSeed() into config_init_hash_seed()
* Move global configuration variables to coreconfig.c

Fix a memory leak in pymain_init_pycache_prefix()
when PYTHONPYCACHEPREFIX and -X pycache_prefix are used.

Add unit tests for argc and argv of _PyCoreConfig.

* Rename _PyCoreConfig.unbuffered_stdio to buffered_stdio
* Rename _PyCoreConfig.debug to parser_debug

Modify frozenmain.c to use _Py_InitializeFromConfig().

Fix a crash on negative STACKADJ() when Low-Level trace (LLTRACE) is enabled.

* Fix integer overflow in os.readv(), os.writev(), os.preadv()
  and os.pwritev() and in os.sendfile() with headers or trailers
  arguments (on BSD-based OSes and MacOS).

* Fix sending the part of the file in os.sendfile() on MacOS.
  Using the trailers argument could cause sending more bytes from
  the input file than was specified.

Thanks Ned Deily for testing on 32-bit MacOS.

* help(hashlib) didn't work because of incorrect module name in blake2b and
  blake2s classes.
* Constructors blake2*(), sha3_*(), shake_*() and keccak_*() incorrectly
  accepted keyword argument "string" for binary data, but documented as
  accepting the "data" keyword argument. Now this parameter is positional-only.
* Keyword-only parameters in blake2b() and blake2s() were not documented as
  keyword-only.
* Default value for some parameters of blake2b() and blake2s() was None,
  which is not acceptable value.
* The length argument for shake_*.digest() was wrapped out to 32 bits.
* The argument for shake_128.digest() and shake_128.hexdigest() was not
  positional-only as intended.
* TypeError messages for incorrect arguments in all constructors sha3_*(),
  shake_*() and keccak_*() incorrectly referred to sha3_224.

Also made the following enhancements:

* More accurately specified input and result types for strings, bytes and
  bytes-like objects.
* Unified positional parameter names for update() and constructors.
* Improved formatting.

 Revert "closes bpo-27494: Fix 2to3 handling of trailing comma after a generator expression (GH-3771)" (#8241)

This reverts commit af810b35.

This is not valid syntax (see bpo-32012).

* The hash of BuiltinMethodType instances no longer depends on the hash
  of __self__. It depends now on the hash of id(__self__).
* The hash and equality of ModuleType and MethodWrapperType instances no
  longer depend on the hash and equality of __self__. They depend now on
  the hash and equality of id(__self__).
* MethodWrapperType instances no longer support ordering.

This list is never used: if detect_types is on, this list will be
replaced with another one before row_cast_map is used, if
detect_types is off, row_cast_map is not used at all.