Better names
Refactored rows and relative ranks
Refactored col and coordinate
Refactored square
Moved magic index bitmask code to where it belongs
Center score adjustment
More utils refactoring
Non-exported abs/min/max
Evaluation tune-up
Better center pawns evaluation
Non-exported ply()
Better knight/bishop outpost scoring
Eliminate position.count
Refactored engine.debug, added DONNA_LOG environment variable