Evaluate king safety when no queen is present.

LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 16657 W: 3547 L: 3391 D: 9719

LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 31258 W: 5664 L: 5403 D: 20191

Bench: 8331165

Resolves #51