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    Launch vehicle simulation for an SSTO vertical launch.

    The goal is to get the vehicle moving horizontally at orbital velocity.

    Uses LaunchVehicle3D which has a 'flat' earth. The simulation can handle
    any number of stages which are set by the arrays d.mStage, d.thruster, d.uE
    and d.cDA each of which have one element for each stage.

    You vary gammaPitchover to get different trajectories. The trajectory is 
    very sensitive to gammaPitchover.

    LaunchVehicle3D uses an exponential atmosphere.

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