BROKEN: serial_io() still not working
BROKEN: serial_io() still not working

The process can now sometimes send a single command to Grbl and maybe
receive one command, but it's still being difficult.

Clearly, bCNC did some sort of sorcery to make it be multi-threaded from
the single-thread of stream.py.

RootAccessHackerspace/k40-laser-scripts,RootAccessHackerspace/k40-laser-scripts