Incremental psqt and material balance

[amanjpro]

Score of zahak_next vs zahak_master: 491 - 426 - 1145  [0.516] 2062
...      zahak_next playing White: 303 - 163 - 565  [0.568] 1031
...      zahak_next playing Black: 188 - 263 - 580  [0.464] 1031
...      White vs Black: 566 - 351 - 1145  [0.552] 2062
Elo difference: 11.0 +/- 10.0, LOS: 98.4 %, DrawRatio: 55.5 %
SPRT: llr 0.364 (12.4%), lbound -2.94, ubound 2.94