This program will detect how many ttyS# available in the "/dev", and add one next avaialable device name in system.
It searches from ttyS0 - ttyS63. if there is no available slot for Megawin USB Virtual COM, it will use ttyS64 as its
default device name.  This program also writes a device Rules, MwUsb2Com.rules in the "/etc/udev/Rules.d". 
