[issue5665] Add more pickling tests

[Collin Winter]

Collin Winter <collinw at gmail.com> added the comment:

test_xpickle currently takes over three minutes on my MacBook Pro to
test compatibility with Python 2.4, 2.5 and 2.6, and adding tests for
the pickle module will at least double that, if not push it well above
10 minutes. That's why I recommend using the resource flag if we want to
add the same tests for the pickle module.

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