Products.genericsetup

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- Add support for Python 3.9.

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- When logging an upgrade, print the version tuple joined by dots.

- Renamed ``xml`` dir to ``xml_templates``.
This avoids an import warning on Python 2.7.

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- Remove Zope 2.13 fossils to stay compatible with Zope 5

- Force saving unpersisted changes in toolset registry.
(`86 <https://github.com/zopefoundation/Products.GenericSetup/issues/86>`_)

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- Fix the sorting of upgrade steps. [vanderbauwhede]

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- no changes since 2.0b6

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- Zope 4 ZMI: Added icon

- Zope 4 ZMI: declare that creating a GS tool does not need an add dialog
(`80 <https://github.com/zopefoundation/Products.GenericSetup/issues/80>`_)

- clean up ``setup.py`` and remove support for ``setup.py test``
(`73 <https://github.com/zopefoundation/Products.GenericSetup/issues/73>`_)

- add support for unicode data in ``writeDataFile``
(`79 <https://github.com/zopefoundation/Products.GenericSetup/issues/79>`_)

- Specify supported Python versions using ``python_requires`` in setup.py

- Adding suport for Python 3.8