[issue1945] Document back ported C functions

[John Lenton]

John Lenton added the comment:

Copied documentation from the py3k branch for the functions mentioned in
the .h's (those were: PyLong_FromSsize_t, PyLong_FromSize_t,
PyLong_AsSsize_t, PyUnicode_FromStringAndSize, PyUnicode_FromString,
PyUnicode_FromFormat, and PyUnicode_FromFormatV). Tested by building the
documentation; everything seems to be in order. Added NEWS entry.

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nosy: +Chipaca
Added file: http://bugs.python.org/file9454/1945.diff

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