Zodbpickle

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- Removed support for the ``bytes_as_strings`` arguments to pickling APIs:
the pickles created when that argument was true might not be unpickled
without passing ``encoding='bytes'``, which ZODB couldn't reliably enforce.
On Py3k, ZODB will be using ``protocol=3`` pickles anyway.

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- Add protocol 3 opcodes to the C version of the ``noload()`` dispatcher.

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- Packaging error: remove spurious ``-ASIDE`` file from sdist.

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- Fix NameError in pure-Python version of ``Unpickler.noload_appends``.

- Fix NameError in pure-Python version of ``Unpickler.noload_setitems``.

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- Fix typo in Python2 version of ``zodbpickle.pickle`` module.

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- Support the common pickle module interface for Python 2.6, 2.7, 3.2, and 3.3.

- Split the Python implementations / tests into Python2- and Py3k-specific
variants.

- Added a fork of the Python 2.7 ``_pickle.c``, for use under Python2.
The fork adds support for the Py3k ``protocol 3`` opcodes.

- Added a custom ``binary`` type for use in Python2 apps.
Derived from ``bytes``, the ``binary`` type allows Python2 apps to pickle
binary data using opcodes which will cause it to be unpickled as ``bytes``
on Py3k. Under Py3k, the ``binary`` type is just an alias for ``bytes``.