Acquisition

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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.

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- Update to include ExtensionClass 2.13.0.

- Fix the ``tp_name`` of the ImplicitAcquisitionWrapper and
ExplicitAcquisitionWrapper to match their Python visible names and thus have
a correct ``__name__``.

- Expand the ``tp_name`` of our extension types to hold the fully qualified
name. This ensures classes have their ``__module__`` set correctly.

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- Added support for method cache in Acquisition. Patch contributed by
Yoshinori K. Okuji. See https://bugs.launchpad.net/zope2/+bug/486182.

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- Fix iteration proxying to pass `self` acquisition-wrapped into both
`__iter__` as well as `__getitem__` (this fixes
https://bugs.launchpad.net/zope2/+bug/360761).

- Add tests for the __getslice__ proxying, including open-ended slicing.

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- More 64-bit fixes in Py_BuildValue calls.

- More 64-bit issues fixed: Use correct integer size for slice operations.