Replace datatype and layertype to data_type and layer_type
Replace datatype and layertype to data_type and layer_type
Basic implementation for impact_function_manager.
Merge branch 'refactor_datatype' into develop
refactor datatype and layertype
Small refactor / renaming.
More implementation for impact_function_manager and refactor.
Add unit test for impact_function_manager.
Refactor almost done.
Use impact_function_manager.
Delete unused functions and unittest
Refactor and run succesfully.
Update unit tests.
Docstring/