-------------------------------------------------------------------------------
   Temperature of a flat plate.
-------------------------------------------------------------------------------
   Form:
   T = TempFP( alpha, epsilon, S, n, u )
-------------------------------------------------------------------------------

   ------
   Inputs
   ------
   alpha         (1,1)  Absorptivity
   epsilon       (1,1)  Emissivity
   S             (1,1)  Heat flux (watts)
   n             (3,1)  Outward unit vector
   u             (3,:)  Unit vector to flux source

   -------
   Outputs
   -------
   T             (1,:)  Temperature (°K)

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