[issue2396] Backport memoryview object to Python 2.7

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Here is an updated patch removing memory_str.
I know Py_TPFLAGS_HAVE_NEWBUFFER should be documented, but I'm not sure
where and how (I didn't add it in the first place).

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Added file: http://bugs.python.org/file13325/memview-trunk3.patch

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