Add canonical header link on each page to corresponding major
version of the documentation.

Patch by Matthias Bussonnier.

the match object.  Based on patch by WGH.

using PySlice_GetIndicesEx() in debug builds.

Patch by Jelle Zijlstra.

Patch by Jelle Zijlstra.

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

Py_LIMITED_API is not set or set to the value between 0x03050400
and 0x03060000 (not including) or 0x03060100 or higher.

PyArg_VaParse() and PyArg_VaParseTupleAndKeywords() were not available in
limited API.  PyArg_ValidateKeywordArguments(), PyArg_UnpackTuple() and
Py_BuildValue() were not available in limited API of version < 3.3 when
PY_SSIZE_T_CLEAN is defined.

Warnings could be emitted at compile time.

The “readline” module already has a workaround using setlocale(LC_CTYPE,
NULL). The code in test___all__ calls getlocale(), which can subtly alter
the locale string and cause the test framework to complain.

Patch by Erik Welch.

prevents http://buildbot.python.org/all/builders/x86%20Ubuntu%20Shared%203.x/builds/240/steps/test/logs/stdio

exited to a stopped instead of terminated state (ex: when under ptrace).