[computer-go] CGOS loop

[Don Dailey]

The testing has uncovered a few bugs that have been fixed.

None of them crashed the server or caused a major problem.

However, someone is running a client that is reconnecting
pretty frequently - I suspect their engine has died.  I think
I would prefer the behavior to be to kill the script completely
when the engine dies, since there is cleary no point in 
this futile loop.   So I will look into this.

- Don