`Force::curve` sums what each unit expects to land as its own crew flies it, which is the shape worth looking at: four designs peaking in four places cover a board, and four peaking in one leave a hole. `helm force` draws it under the table. Battle armour is counted per suit rather than per file at last - a Point of five Elementals lands 25.3 where one suit landed 7.0 - and an anti-personnel weapon is left out of that multiplication, its damage being per trooper already. Change-Id: Iefa498b3917fe042ad6fbe7c6b04a70a0a369ab3