ChessKISS 2.3, yes! this time with tuning

Oh well, some tunings were tough and also weird, but I manage to somehow have better values and thus improve the ELO (not sure how much...)

What's new?

• SPSA (search) and Texel (evaluation) tuning done, my room has never been so warm
• All evaluation tables moved to the parameters, so the tuners can play with them
• Many parameters were not symmetric (a-file vs h-file, white vs black): chess is symmetric, my tables weren't (shame on me, again)
• Mobility tables are now symmetric
• Material imbalance scored for both sides, before its value depended on who was to move (oops)
• Threat detection was not symmetric between sides
• SEE treats knights and bishops as equals
• The weak f-pawn penalty no longer depends on the castling history
• Safer pruning in quiescence: delta and futility use the biggest of the middlegame and endgame values
• Smarter skipping of silly captures in quiescence
• New ProbCut phase in the move picker, and a faster ProbCut
• A mate on the hundredth half-move is a mate, not a fifty-move draw (FIDE agrees)
• Data reordered for better memory locality
• The board can write its own FEN

I also took the opportunity to clean and improve the readme.txt which was to say the least too lazy...

please download it at ChessKISS 2.3