---------------------------------------------------------------------------
   Total pressure.
---------------------------------------------------------------------------
   Form:
   pT = PressureTotal( p, gamma, machNo )
---------------------------------------------------------------------------

   ------
   Inputs
   ------
   p          (1,1)   Pressure
   gamma      (1,1)   Ratio of specific heats
   machNo     (1,:)   Mach number

   -------
   Outputs
   -------
   pT          (1,:)  Total pressure

---------------------------------------------------------------------------