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  Name:     hex2dec() - convert a hexadecimal string to an integer
  Usage:    <integer> = hex2dec(<hexstring>)
  Params:   string <hexstring> in the format "nnnn" where nnnn is
            a hexadecimal number in either 2 byte or 4 byte
            format.

  Returns:  an unsigned integer equal to the decimal equivalent
            of the <hexstring>, or -1 if the <hexstring> contains
            invalid hexadecimal characters.

 ---------------------------------- Example ---------------------------------

                 ? hex2dec("FFFF")
                 * prints 65535