MHTLLRUpdate:

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   Update the log likelihood ratio.
   Inputs are the kinematic and signal. Either can be empty.
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   Form:
   lLR = MHTLLRUpdate( lRK, lRS, lLR )
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   ------
   Inputs
   ------
   lRK       (1,:) Kinematic likelihood ratios
   lRS       (1,:) Signal likelihood ratios
   lLR       (1,1) Log likelihood ratio

   -------
   Outputs
   -------
   lLR       (1,1) Log Likelihood ratio

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   Reference: Blackman, S. and R. Popoli, "Design and Analysis of  Modern
              Tracking Systems," Artech House, 1999, p. 328-330.
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