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
Cleans SEP model reader and adds a couple of comments
Adds CUSTOM_REAL to arguments to pass double precision test
Revert m4
Merge pull request #244 from mpbl/devel

Devel
Revert "Devel"
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