Apply King Safety later in the endgame

Based on this discussion:
https://groups.google.com/forum/?fromgroups=#!topic/fishcooking/2FPhgpHtefQ

Idea is to apply king safety later in the endgame. Previously, we didn't apply KS in a
RR vs. Q ending for example, which causes poor play. Now we calculate king attacks
when the attacking side has a queen or more.

**STC with 8moves_v3**

    LLR: 3.06 (-2.94,2.94) [0.00,4.00]
    Total: 38481 W: 6228 L: 5952 D: 26301

**LTC with 2moves_v1**

    LLR: 2.95 (-2.94,2.94) [0.00,4.00]
    Total: 51053 W: 8670 L: 8353 D: 34030

bench 7119712