[computer-go] Slow KGS computer Go Tournament

[William M. Shubert]

Oops, sorry for not notifying people here about the the change. I
assumed that people would notice the change when they logged in for
non-tournament use, but people who only use kgsGtp for tournaments would
find out at the worst possible time. :-(

It is a simple change. Just change "tournament=t" into "mode=tournament"
as the message you get says. Before I had a bunch of flags, where you
could only set one, so it made sense to just have a single "my mode
is..." option. That is the reason for the change.