Zope.deprecation

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- Replaced doctesting with unit testing.

- Python 3 compatibility.

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- Removed import cycle for ``__show__`` by defining it in the
``zope.deprecation.deprecation`` module.

- Added support to bootstrap on Jython.

- Fix ``zope.deprecation.warn()`` to make the signature identical to
``warnings.warn()`` and to check for .pyc and .pyo files.

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- Release 3.4 final, corresponding to Zope 3.4.

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- Corresponds to the version of the ``zope.deprecation`` package shipped as
part of the Zope 3.3.0 release.