Manpages of src:libserial in Debian testing

• LibSerial(1)
• LibSerial(3)
• LibSerial_SerialStream(3)
• LibSerial_SerialStreamBuf(3)
• SerialPort(3)
• SerialPort.h(3)
• SerialPort_AlreadyOpen(3)
• SerialPort_NotOpen(3)
• SerialPort_OpenFailed(3)
• SerialPort_ReadTimeout(3)
• SerialPort_UnsupportedBaudRate(3)
• SerialStream.h(3)
• SerialStreamBuf.h(3)