Increase history adjustments when pawn structures differ

[pkrisz99]

This patch boosts history score adjustments if the pawn structure is different from when the score was last updated. The general idea is that if a history entry is stale, we should help it update more easily.

Further considerations:

• it's most likely enough to save only 8 bits per entry instead of 16
• the two tables could be rearranged in a way that the hash and the score is adjacent in memory (esp. if later tried with conthist)
• just to be sure, a simplification should be run later with always applying the larger adjustments

Elo   | 3.73 +- 2.60 (95%)
SPRT  | 10.0+0.10s Threads=1 Hash=16MB
LLR   | 2.90 (-2.25, 2.89) [0.00, 3.50]
Games | N: 18276 W: 4096 L: 3900 D: 10280
Penta | [49, 2121, 4619, 2283, 66]
https://zzzzz151.pythonanywhere.com/test/1402/

Renegade dev 1.1.47 Bench: 2436629