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- Add ``IRawReadFile`` and ``IRawWriteFile`` interfaces. These extend
``IReadFile`` and ``IWritefile``, respectively, to behave pretty much like a
standard Python file object with a few embellishments. This in turn allows
efficient, iterator- based implementations of file reading and writing.
- Remove dependency on ``zope.container``: ``IReadDirectory`` and
``IWriteDirectory`` inherit only from interfaces defined in ``zope.interface``
and ``zope.interface.common.mapping``.