Repeat abstract simulate for CompositeModel
Repeat abstract simulate for CompositeModel

- satisfies pylint

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