[issue1919] Backport of io.py

[Thomas Heller]

Thomas Heller added the comment:

> * backport bytearray and the new buffer interface from 3.0

backport of the new buffer interface is required for PEP 3118 which is
marked accepted:

"
It is intended that this PEP will be back-ported to Python 2.6 by adding
the C-API and the two functions to the existing buffer protocol.
"

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nosy: +theller

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