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   Power conversion to decibels. dB = 20 log10(s).
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   Form:
   dB = DBPower( p )
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   ------
   Inputs
   ------
   p			  (:)     Power
                        
   -------
   Outputs
   -------
   dB      (:)     Decibels
                         
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	  References:	Lambert, S. G. and W. L. Casey (1995.) Laser Communications in
               Space. Artech, Boston.
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