[issue1395] py3k: duplicated line endings when using read(1)

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

> io3.diff does replacenl() in adjust_chunk() (trying Amaury's
> suggestion). Can you see if it fixes test_mailbox failures?

Unfortunately, it does not. And some tests now fail in test_io
(correcting testTelling seems a good start point, since we just changed
the tell() behaviour)

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