MHTTrackMerging:

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   Merges tracks.

   Rules: - One measurement is associated with each track
          - If two tracks only differ by missed measurements they are
            merged

   Type MHTTrackMerging for a demo.
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   Form:
   b = MHTTrackMerging( b, n )
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   ------
   Inputs
   ------
   b        (m,n)  [scans, tracks]

   -------
   Outputs
   -------
   kD       (1,:)  Tracks to delete

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   Reference: A. Amditis1, G. Thomaidis1, P. Maroudis, P. Lytrivis1 and
              G. Karaseitanidis1, "Multiple Hypothesis Tracking
              Implementation," www.intechopen.com.
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