View the relative motion associated with a set of geometric goals and a
   given reference orbit.

   Alternatively, the second input may be provided as a set of N orbital
   element vectors (Alfriend format) rather than geometric goals. (size Nx6)

   Since version 7.
   sc = ViewRelativeMotion( el0, goals, nOrbits );
   sc = ViewRelativeMotion( el0, el, nOrbits );

   el0             (1,6)     Reference orbital elements (Alfriend format) [a,th,i,q1,q2,W]
   g                (.)      Geometric goals data structure with following fields:
                                - y0     along-track offset                       [km]
                                - aE     semi-major axis of relative ellipse      [km]
                                - beta   angle on ellipse at perigee              [rad]
                                - zInc   cross-track amp. due to inc. diff        [km]
                                - zLan   cross-track amp. due to right ascen diff [km]
   nOrbits          (1)      Number of orbits to simulate  [orbits]

   sc               (.)      Data structure array of position, velocity, time data
                               for each spacecraft
     - r           (3,:)     Relative Hills frame position [km]
     - v           (3,:)     Relative Hills frame velocity [km/s]
     - t           (1,:)     Time [sec]



FormationFlying: DataStructures/Geometry_Structure
FormationFlying: Transformation/AbsRelECI2Hills
FormationFlying: Transformation/Goals2DeltaElem
Math: Trigonometry/WrapPhase
Orbit: OrbitCoord/Alfriend2El
Orbit: OrbitCoord/El2Alfriend
Orbit: OrbitMechanics/RVOrbGen
Plotting: GUI/AnimationGUI
SC: BasicOrbit/OrbRate
SC: BasicOrbit/RV2El