Decided the chunks / ensemble results per thread will be written as jsons and not as raw strings. Changed tests accordingly

Fixing tests that failed. Added a function to filter dicts based on value instead of key. Added M&S data to grid options rather than custom options

remove deprecated resolution setting

own source files

add option "save_ensemble_chunks" to make sure the ensemble chunks are saved : I am chasing up a grid that completely froze (and gave segfaults) ...