[issue1751] Fast BytesIO implementation + misc changes

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

There is a small bug in the last patch I posted. The unit tests assumed
(wrongly) that accelerator module for io.StringIO (i.e., _stringio) was
present.

Added file: http://bugs.python.org/file9905/bytesio+misc-fixes-6.patch

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