Restrictedpython

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- Corresponds to the verison of the RestrictedPython package shipped
as part of the Zope 3.1.0 release.

- Remove unused fossil module, ``SafeMapping``.

- Replaced use of deprecated ``whrandom`` module with ``random`` (aliased
to ``whrandom`` for backward compatibility).

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- Corresponds to the verison of the RestrictedPython package shipped
as part of the Zope X3.0.0 release.