Simplify connected #2114

This is a functional simplification that simplifies
some of the math for connected pawns. The bench is
different because I moved a /2 from opposed into
the connected array.

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 37954 W: 8504 L: 8415 D: 21035
http://tests.stockfishchess.org/tests/view/5cbf599a0ebc5925cf028156

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 27780 W: 4682 L: 4572 D: 18526
http://tests.stockfishchess.org/tests/view/5cbf6a5e0ebc5925cf0284b8

Bench 3824325