Products-pythonscripts

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- Force recompilation of scripts as the compiled code is now stored
on `__code__` instead of `func_code`.

- Add a Python 3 compatible default script.
https://github.com/zopefoundation/Products.PythonScripts/pull/10

- Fix security declaration for ``Products.PythonScripts.standard`` which was
broken since version 3.0.
https://github.com/zopefoundation/Zope/issues/209

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- Add support for Python 3.4 up to 3.6.

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- Remove `bobobase_modification_time` from edit template.

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- Add compatibility with webdav changes in Zope 4.0a2.

.. caution::

This version needs Zope2 >= 4.0 to run!

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- Remove HelpSys support.

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- Correct module security declaration for our `standard` module.