public boolean addIlluminatedPosition(Coords c){
  boolean rv=illuminatedPositions.add(c);
  processGameEvent(new GameBoardChangeEvent(this));
  return rv;
}

public boolean addIlluminatedPosition ( Coords c ) { boolean rv = illuminatedPositions . add ( c ) ; processGameEvent ( new GameBoardChangeEvent ( this ) ) ; return rv ; }
add a new hex to the collection of coords illuminated by searchlights .
