[Patches] slightly expanded Unicode supported Py_BuildValue

[Brian Hooper]

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OK, here's the patch, and a corresponding documentation patch.

Added 'u' and 'u#' tags for PyArg_ParseTuple - these turn a
PyUnicodeObject argument into a Py_UNICODE * buffer, or a Py_UNICODE *
buffer plus a length with the '#'.  Also added an analog to 'U'
for Py_BuildValue, and documented each in ext.tex.

--Brian

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