Timelink

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* Fixes bug in package descrition preventing release in Pypi.

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* All core ORM models for MHK databases
* Dynamic generation of ORM models from XML
files produced by the Kleio translator.
* Python definition of Kleio groups allows synonyms to be defined for
localized elements.
* Import from XML file to MHK database
* CLI interface refactored with `Typer`
* Improved documentation

Developement related changes

* `black` can be used to format code
* More and better tests, handling of MHK
installation or lack of in CI tests

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* Fixes bugs related to mapping legacy MHK databases

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* Adds indexes to models
* Added sqlite test db
* Better testing, travis integration improved
* Replaced click with typer in cli interface

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* Update documentation.

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* Add to_json() method to KGroup, enabling Kleio to JSon serialization.