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Breaking changes:
- Removed versioning_config.py and versioning_config_form.pt from skin.
Instead, you can change the versioning config in the ``content-controlpanel``.
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- Removed migration code from version 1.0alpha3 to 1.0beta1 from 2006.
Removed Storage Migration Support.
This had code for creating a test hierarchy for migration tests.
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- Removed unused versions_history.pt which defines a versions_history macro.
We do still have versions_history_form.
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New features:
- Merged skin script ``checkUpToDate`` into ``versions_history_form`` view.
Merged ``can_diff`` view into ``versions_history_form`` view.
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- Remove now empty CMFEditions skin layer in an upgrade step.
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- Moved various items from from skin to a browser view:
``saveasnewversion``, ``revertversion``, ``diff_legend``, ``versions_history_form``, ``compare.css``.
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Bug fixes:
- Removed version_diff.pt.
This template is deprecated. Use the history view instead.
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- QA: black, isort, flake8, fix deprecation warnings, remove use of six, upgrade to Python 3.7-only syntax.
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