* move set attr param_file before reading file, oops!
* add _param_cls to calculations, outputs and simulations
* also use mcs.set_meta() in formulas, calculations, outputs and simulations
* remove reading param files, since already doing it in set_param_or parameters in common base
* add test to see if data parameters from file are also updated from class parameters
* change simulation param file to have a settings key
* move class dependencies and calculators from param file to Meta in model calc classes