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Stockfish 16040819_mstembera - best chess engine

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Stockfish - chess engines UCI

Previous version chess engine Stockfish 

Author compilation - mstembera 

Timestamp: 1460137935 

Simplify popcnt 

Also a speedup(about 1%) on 64-bit w/o hardware popcnt 

Retire Max15 and Full template parameters (Contributed by Marco Costalba) 

Now that we have just SW and HW versions, use template default parameter to get rid of explicit template parameters. 

Retire bitcount.h and move the only defined function to bitboard.h 

No functional change 

Resolves #620 

JCER=3247



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