Products.dcworkflow

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- Add support for Python 3.8.

- Fix import of scripts.

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- Prepare for Python 2 / 3 compatibility

- Import permissions directly from CMFCore and deprecate the
permissions module in Products.DCWorkflow

- Use decorators for ZCA and to declare security.

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- Target use with Zope 4: no longer support 2.13.x.

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- Export / import workflow-managed groups.

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- Removed string exceptions.
(https://bugs.launchpad.net/zope-cmf/+bug/952301)

- Made sure converted tools are used as utilities.

- StateChangeInfo: Removed support for deprecated '_isPortalRoot' marker.

- Hardened XML import parsing against missing boolean attributes.
(https://bugs.launchpad.net/zope-cmf/+bug/707927)

- Ensured that emitted XML export has a valid encoding, even when passed
'None'. (https://bugs.launchpad.net/zope-cmf/+bug/707927)

- Change default encoding of exports from None to utf-8.

- Require at least Zope 2.13.12.

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- Fixed issue with non-ascii chars in workflow definitions

- Don't crash worklist's ``manage_main`` if variables are Expression objects.
(https://bugs.launchpad.net/zope-cmf/+bug/731394)

- Allow renaming of states, transitions, variables and worklists