v1.3.0

Ports now only allow exclusive access, returning -EBUSY if a process tries to open a port in use
Ports now only allow write() system calls if the other pair is open, returning -ENODEV if its not so
Fixed memory leak happening on do_close()
Fixed some race conditions happening on writes
Port open status can now be read at /proc/tty/driver/emulatedport_tty
Added stress test for Webots and improved default testing