/* $DOC$
   $NAME$
      ft_Hex2Dec()
   $CATEGORY$
      Conversion
   $ONELINER$
      Convert a hex number to decimal
   $SYNTAX$
      ft_Hex2Dec( <cHexNum> ) -> nDecNum
   $ARGUMENTS$
      <cHexNum> is a character string representing a hex number.
   $RETURNS$
      A decimal number.
   $DESCRIPTION$
      Converts a hexadecimal number to a BASE 10 decimal number.
      Useful for using ft_int86().
   $EXAMPLES$
      ft_int86( ft_Hex2Dex( "21" ), aRegs )

      // Converts 21h, the Dos Interrupt, to its decimal equivalent,
      // 33, for use by ft_int86().
   $END$
 */