-------------------------------------------------------------------------------
   RIght-hand-side for an isothermal spacecraft model.
   This is a wrapper function for RHSIsothermal
-------------------------------------------------------------------------------
   Form:
   f = RHSIsothermalUKF( x, t, u )
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   ------
   Inputs
   ------
   x         (1,1)  State [t]
   t         (1,1)  Time (not used)
   u         (1,1)  Data structure

   -------
   Outputs
   -------
   f         (1,1)  State derivative

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   References: None
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