public void addExtremeGravityPSR(PilotingRollData psr){
  extremeGravityRolls.addElement(psr);
}

public void addExtremeGravityPSR ( PilotingRollData psr ) { extremeGravityRolls . addElement ( psr ) ; }
adds a pending extreme gravity psr to the list for this phase .
