Better opening set

Intended to increase elo sensitivity, and avoid repetitions:
* 31,526 unique positions
* 2.5 moves (5 plies) from starting position
* created by systematic algorithm: perft + random sample + filtering

for more details:
https://groups.google.com/forum/?fromgroups=#!searchin/fishcooking/opening$20set/fishcooking/F1c1MGtmUno/Z7b7U7BY35MJ
Fix min/max order in VAR file

min before max is more logical:
* UCI options follow this order
* Stockfish too (see ucioptions.cpp)