MassPowerConversion:

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   Power conversion mass.
   Assumes 20% conversion efficiency.
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   Form:
   [m, name] = MassPowerConversion( p )
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   ------
   Inputs
   ------
   p        (1,:) Power Thermal (MW)

   -------
   Outputs
   -------
   m        (1,4) [mass brayton, heat rejection, power mgmt total] (kg)
   name     {:}   Corresponding name

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	References: Lee S. Mason,  "Power Conversion Concept for the Jupiter
               Icy Moons Orbiter," NASA/TM?2003-212596.
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