Updates to the Plausible Lower Bound

Generalizations made:

hill-sector-868-1,  hill-sector-863-1  -->  hill-sector
hill-sector-863-2,  hill-sector-878-2  -->  hill-sector
hill-sector-875-2,  hill-sector-863-2  -->  hill-sector
platoon-d1, platoon-d2  -->  armored-platoon

Old plausible lower bound elements

P1     IS   platoon-d1
P2     IS   platoon-d2
HS-I   IS   hill-sector-868-1,   IN AR,   VISIBLE E,
       DISTANCE-TO-ENGAGEMENT-AREA   close
HS-TP1 IS   hill-sector-863-2,   IN AR,   VISIBLE E
HS-TP2 IS   hill-sector-875-2,   IN AR,   VISIBLE E

New plausible lower bound elements

P1     IS   armored-platoon
P2     IS   armored-platoon
HS-I   IS   hill-sector,   IN AR,   VISIBLE E
       DISTANCE-TO-ENGAGEMENT-AREA,   close
HS-TP1 IS   hill-sector,   IN AR,   VISIBLE E
HS-TP2 IS   hill-sector,   IN AR,   VISIBLE E