/* $DOC$
   $NAME$
      ft_N2Color()
   $CATEGORY$
      String
   $ONELINER$
      Returns the string complement of a Clipper color number
   $SYNTAX$
      ft_Color2N( <nColor> ) -> cColor
   $ARGUMENTS$
      <nColor> a number representing a Clipper color
   $RETURNS$
      The string complement of a number representing a Clipper or a
      null string if the parameter is invalid
   $DESCRIPTION$
      This function is useful for converting a number to a Clipper color
      string.
   $EXAMPLES$
      ? ft_Color2N( 239 )         // returns "*+w/gr"
   $SEEALSO$
      ft_N2Color()
   $END$
 */