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   Computes the noise power required from bandwidth and noise temperature.
   Has a built-in demo.
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   Form:
   p = NoisePower( t, b )
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   ------
   Inputs
   ------
   t          (1,:)  Noise temperature (deg-K)
   b          (1,:)  Bandwith (Hz)

   -------
   Outputs
   -------
   p          (1,1)  Noise Power

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   Reference: Swenson, G.W. (2000.) "Intragalatically Speaking." Scientific
              American. July 2000. p. 46.
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