Adds initial files for SEP models
Adds enum value for SEP model
parse parameter file for SEP_MODEL_DIRECTORY
Adds argument to read_parameter_file for SEP models
Adds SEP model to compilation chain
Fixes sep model after testing it.
Adds example for sep model
Updates SEP example coarser mesh and stations
Adds routine for SEP model in case of no MPI
Updates SEP Stations list