changing starshadeVelocity method to starshadeBoundaryVelocity to calculate the true rotating frame velocity for stationkeeping. used as BC for slewing. also removed unused methods
changing starshadeVelocity method to starshadeBoundaryVelocity to calculate the true rotating frame velocity for stationkeeping. used as BC for slewing. also removed unused methods

dsavransky/EXOSIMS,dsavransky/EXOSIMS