Add delete scenario and narrative functions to datafile interface
Add delete scenario and narrative functions to datafile interface

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