Flotils

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* add convenience module (PrintableBase, FromToDictBase)
* add save_file/load_file to Loadable
* remove deprecated logException, warn from Logable
* __future__ imports in runable

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* Deprecated camel-case methods in loadable, new save/load methods

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* Add yaml loading/saving code

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* Add get_logger function

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* Fix relative import in loadable

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* Add datetime.timedelta to JSONEncoder/Decoder