Plot3DTrajectory:

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   Propagate and plot a 3D trajectory using outputs from optimization.

   Since version 7.
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   Form:
   rMag = Plot3DTrajectory( lambda, d, units, plotTitle  )
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   Inputs
   ------
   lambda         (6,1)  Costates
   d              (1,1)  Structure to pass to fun
                         .costFun
                         .mu
                         .rF
                         .xF
                         .el0     (1,6) Initial orbit orbital elements
                         .elF     (1,6) Final orbit orbital elements
   units          (1,:)  Units for position
   plotTitle      (1,:)  Title for plots

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   Outputs
   -------
   b              (1,1)  Data structure
                         .r (3,:) Position
                         .v (3,:) Velocity 
                         .t (1,:) Times

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