Acquisition

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- Fixed bug: When an object did not implement ``__unicode__``, calling
``unicode(wrapped)`` was calling ``__str__`` with an unwrapped ``self``.

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- Add ``aq_explicit`` to ``IAcquisitionWrapper``.

- Fixed bug: ``unicode(wrapped)`` was not calling a ``__unicode__``
method on wrapped objects.

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- Fixed unit tests that failed on 64bit Python on Windows machines.

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- LP 623665: Fixed typo in Acquisition.h.

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- Use the doctest module from the standard library and no longer depend on
zope.testing.

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- Give both wrapper classes a ``__getnewargs__`` method, which causes the ZODB
optimization to fail and create persistent references using the ``_p_oid``
alone. This happens to be the persistent oid of the wrapped object. This lets
these objects to be persisted correctly, even though they are passed to the
ZODB in a wrapped state.

- Added failing tests for http://dev.plone.org/plone/ticket/10318. This shows
an edge-case where AQ wrappers can be pickled using the specific combination
of cPickle, pickle protocol one and a custom Pickler class with an
``inst_persistent_id`` hook. Unfortunately this is the exact combination used
by ZODB3.