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    Launch vehicle simulation for an SSTO vertical launch.

    The goal is to get the vehicle moving horizontally to the radius vector
    at orbital velocity. The launch is vertical and at the 10th time step
    we rotate the velocity vector.

    Uses LaunchVehicle3D which has a spherical 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. This uses a full
    3 dimensional dynamical model in cartesian coordinates. 

    You vary gammaPitchover to get different trajectories. The trajectory is 
    very sensitive to gammaPitchover. You can also change the time step for
    the pitch over by changing kPitch.

    LaunchVehicle3D uses an exponential atmosphere.

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