Implement Datalayer / write_sos_model(), write_sector_model() and write_model_run()
Implement Datalayer / write_sos_model(), write_sector_model() and write_model_run()

nismod/smif,willu47/smif,willu47/smif,nismod/smif,willu47/smif,nismod/smif,tomalrussell/smif,tomalrussell/smif,tomalrussell/smif,tomalrussell/smif,nismod/smif,willu47/smif