Pick best moves one per cycle instead of sorting
When the move list is very small, like captures normally
are, it is faster to pick the best move with a linear
scan, one per cycle.
This has the added advantage that the picked capture move is
very possibly a cut-off move, so that other searches are
avoided. For non-captures it is still faster to sort in
advance.
Because scan-and-pick alghortim is not stable, node count
has changed.
After 885 games at 1+0
Mod vs Orig +196 =510 -179 50.96% 451.0/885
Signed-off-by: Marco Costalba <mcostalba@gmail.com>