ViewRotatingHillsFrame:

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   Animate a satellite's relative trajectory in the inertial frame. 
   Show the satellite traverse the relative trajectory while the trajectory 
   is shown rotating around the orbit path. 

   Since version 7.
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   Usage:
   h = ViewRotatingHillsFrame( rECI, vECI, rHills )
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   Inputs
   ------
   rECI         (3,:)  Inertial position over time
   vECI         (3,:)  Inertial velocity over time
   rHills       (3,:)  Hills-frame position over time

   -------
   Outputs
   -------
   h             (1)   Handle to figure
   
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Children:

AeroUtils: Coord/QHills
Common: Graphics/NewFig
Common: Quaternion/QForm
Common: Quaternion/QPose
FormationFlying: Dynamics/HillsEqns
Math: Linear/Mag
Orbit: OrbitMechanics/RVOrbGen
SC: BasicOrbit/OrbRate
SC: BasicOrbit/Period