Fews-3di

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- Reading and storing saved states added.

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- Release mechanism fix.

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- Added lateral upload.

- Added rain upload.

- Added evaporation upload.

- Simulation is actually being run now.

- Added processing of the results.

- Added usage instructions.

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- Started copying code from the old project.

- Got 3Di api connection to work, including creating an (empty) simulation.

- Initial project structure created with cookiecutter and
https://github.com/nens/cookiecutter-python-template