/* $DOC$
   $NAME$
      ft_D2E()
   $CATEGORY$
      Conversion
   $ONELINER$
      Convert decimal to scientific notation
   $SYNTAX$
      ft_D2E( <nDec>, <nPrecision> )  -> <cNumE>
   $ARGUMENTS$
      <nDec>         Decimal number to convert

      <nPrecision>   Number of decimal places in result.
                     Defaults to 6 decimal places.
   $RETURNS$
      <cNumE>        A string representing a number in
                     scientific notation
   $DESCRIPTION$
      Given a decimal number and the desired precision,
      a string representing the equivalent in scientific
      notation is returned.
   $EXAMPLES$
      ? ft_D2E( 12.345, 2 )     // -> 1.23E1
      ? ft_D2E( -12.345, 3 )    // -> -1.235E1
      ? ft_D2E( 0.00000543, 2 ) // -> 5.43E-6
   $SEEALSO$
      ft_E2D()
   $END$
 */