[issue1152248] Add support for reading records with arbitrary separators to the standard IO stack

[Akira Li]

Akira Li added the comment:

> As a side-effect it also fixes the bug in line_buffering=True
> behavior, see issue22069O.

It should be issue22069 "TextIOWrapper(newline="\n", line_buffering=True) 
mistakenly treat \r as a newline"

Reuploaded the patch so that it applies cleanly on the current tip.

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Added file: http://bugs.python.org/file36114/io-newline-issue1152248-2.patch

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