improve LMP formula (6675484)
update ponder move with best move
Merge branch 'master' into lmp_formula

Validated by "risk-neutral" SPRT (elo0=-2.5 elo1=+2.5 alpha=beta=0.1) in 5"+0.05"
Score of ./chess/lmp_formula vs ./chess/master: 2628 - 2540 - 3865  [0.505] 9033

Scaling is not a risk for this kind of patch, since LMP formula is made more aggresive.