Tree stats fix for huge DBs from Patrick / AI Muse Spark - Tree window shows wrong AvElo values for frequent moves in the start position becauses of 32bit int overflow.
Initial commit for Patricks Engine arrows v2. Todo check Menus and translations.
see prev commit.
boardEngine default is -1, not 0.
Rework Arrow Options a bit and add an 's' key binding for displaying Engine PV on mainboard - with code from Patrick. Todo - resolve ::mainEngine and analysis(boardEngine).
Old xboard housekeeping. Rename sendMoveToEngine to sendMoveToXboardEngine.
Patrick's feature to throttle the engine arrow redraws to 200ms, and some hardening to updateAnalysisText
Related analysis board/help tweaks