[computer-go] The effect of the UCT-constant on Valkyria

[Olivier Teytaud]

> The results confirm that Valkyria still benefits from using confidence bounds 
> with UCT, although the effect is really small.

The standard deviation is a bit large for concluding.

I'll try to get similar numbers for mogo. For the moment
everything leads to 0 as the best constant, but perhaps
it will be different with larger numbers of sims/second.
Olivier