Products.zctextindex

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- Specify supported Python versions using ``python_requires`` in setup.py
(`Zope481 <https://github.com/zopefoundation/Zope/issues/481>`_)

- Dropped support for Python 3.4 as Zope does not support it anymore.

- Added support for Python 3.7 and 3.8

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- Mark as compatible with Python 2 and 3.

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- Fix version number of ZCatalog requirement to be PEP compliant.

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- Move code into ZCatalog distribution.

- Implement new `IQueryIndex` interface.

- Require at least Zope and ZCatalog 4.0.

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- Replace stopper and okascore C implementations with pure-Python.

- Remove HelpSys pages.

- Remove various internal test helper modules.

- Remove old-style interface modules, use the interfaces module instead.

- Update to ZODB 4.x as direct dependency. Which drops ZODB3 support.