Add an unit test on the _struct.Struct.unpack_from() method to test passing
arguments as keywords.

* The struct module now requires contiguous buffers.
* Convert most functions and methods of the _struct module to Argument Clinic
* Use "Py_buffer" type for the "buffer" argument. Argument Clinic is
  responsible to create and release the Py_buffer object.
* Use "PyStructObject *" type for self to avoid explicit conversions.
* Add an unit test on the _struct.Struct.unpack_from() method to test passing
  arguments as keywords.
* Rephrase docstrings.
* Rename "fmt" argument to "format" in docstrings and the documentation.

As a side effect, functions and methods which used METH_VARARGS calling
convention like struct.pack() now use the METH_FASTCALL calling convention
which avoids the creation of temporary tuple to pass positional arguments and
so is faster. For example, struct.pack("i", 1) becomes 1.56x faster (-36%)::

    $ ./python -m perf timeit \
        -s 'import struct; pack=struct.pack' 'pack("i", 1)' \
        --compare-to=../default-ref/python
    Median +- std dev: 119 ns +- 1 ns -> 76.8 ns +- 0.4 ns: 1.56x faster (-36%)
    Significant (t=295.91)

Patch co-written with Serhiy Storchaka.

_Pickle_FastCall() has a surprising API: it decrements the reference counter of
its second argument.

method when unpickle collections.deque and other list-like objects.
This can speed up unpickling to 2 times.

Based on patch by Vajrasky Kok.

Issue #29367. On Python 2, __init__ name is render as u'__init__'.

Rename also "l" argument to "nargs".

Issue #29318: Caller and callee functions must not share the dictionary:
kwargs must be copied.

Issue #29367. Use two break points to prevent breakpoint during Python
initialization.

Issue #29367: python-gdb.py now supports also method-wrapper (wrapperobject)
objects.

It has been documented as unused since 6c6844a2fa30 (2000-05-25)

Patch by Eric N. Vander Weele.

It was renamed to README.txt in d90a65014c42 and it was
back by a merge commit accidentally.