PlotTracks:

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   Plot the track states vs. time. Creates one figure with subplots.
   Plots trk.mHist vs. trk.tHist, where mHist is the history of the mean 
   states returned from the Kalman filter. This data is stored with the
   tracks by MHTTrackMgmt.
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   Form:
   PlotTracks( trk )
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   ------
   Inputs
   ------
   trk   (:)   Track data structure array

   -------
   Outputs
   -------
   None.

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Children:

Common: Graphics/NewFig
Common: Graphics/TitleS