[computer-go] 19x19 Study

[Olivier Teytaud]

I can provide a new release with double instead of float.
(unless the other mogo-people reading this mailing-list do not agree for 
this; Sylvain, no problem for you ?).

> I don't know exactly when it begins to do bad moves. However, I know that
> after several hours, the estimated winning rate converges to 1 or 0, with
> crazy principal variations, and the cause is low resolution of single
> floats. In this study, it should no be a big factor of unscalability given
> the number of simulations.