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   Add a heater and thermistor to each component. 
   It only adds devices to the subsystems that exist when this is called. 
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   Form:

   AddThermalDevices( g, heaterPower )
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   ------
   Inputs
   ------
   g               (1,1)  Component data structure
   heaterPower     (1,1)  Heater power

   -------
   Outputs
   -------
   None

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