Pawn Correction History

[jnlt3]

Add SGD based pawn correction history.

Passed STC:

Elo   | 4.68 +- 3.22 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=8MB
LLR   | 2.95 (-2.94, 2.94) [0.00, 4.00]
Games | N: 13952 W: 3524 L: 3336 D: 7092
Penta | [107, 1625, 3359, 1743, 142]

Passed LTC:

Elo   | 10.63 +- 4.99 (95%)
SPRT  | 40.0+0.40s Threads=1 Hash=64MB
LLR   | 2.95 (-2.94, 2.94) [0.00, 4.00]
Games | N: 4608 W: 1179 L: 1038 D: 2391
Penta | [11, 454, 1238, 585, 16]