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   Compute the Mach number
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   Form:
   m = MachNo( u, gamma, molWt, T )
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   ------
   Inputs
   ------
   u           (n)    Velocity (m/sec)
   gamma       (1,1)  Ratio of specific heats
   molWt       (1,1)  Average molecular weight of the gas (kg/mole)
   T           (m)    Temperature (deg-K)

   -------
   Outputs
   -------
   m           (n,m)   Mach number
  
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