Changes to SerialPort.cpp to remove bug
CSerialPort: there's no need to append /dev/ to the serial port. If we get a ttyS without /dev/ in front of it, that's a bug in the caller. pciXXX identifiers for USB serial ports aren't system paths at all, so they never ever have /dev/ in front. If the caller isn't using ListSerialPorts.sh or the AvailableSerialPorts DeviceData, that's a bigger bug.