Experta

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* Resolved 7. In some situations last activation was removed right
after entering the agenda.

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* Resolved 3. Rules should not be called with already retracted facts.

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* Drop Python 3.4 support.
* Use setup.cfg to save all package metadata.

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* Rebranded to Experta.

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* Implemented the template system.
* Replaced warnings by watchers messages.
* Fixed freeze() with frozen objects.
* Fixed unfreeze() with unfrozen objects.
* Parametrized DefFacts via reset() kwargs.

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* Improved overall performance.