Products.zsqlmethods

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- Add support for Python 3.9.

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- Zope 4 ZMI improvements for database connection test form.

- Fix the ``repr`` of SQL Methods.

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- Improve pagination and search result display on the ZMI `Test` tab
(`28 <https://github.com/zopefoundation/Products.ZSQLMethods/pull/28>`_)

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- Removed last remnants of the Zope 2 Help System.

- Zope 4 ZMI improvements for ZSQL Method objects.

- Zope 4 ZMI improvements for database connection objects.

- Package and ``tox`` configuration cleanup to allow runing tests in parallel.

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- Added explicit type selection for ZSQL parameters on the ZMI `Test` tab.

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- Improved usability for the ZMI `Test` tab.