Scattered woods rather than heavy forest or open terrain: on either of those every hex answers the same way and the column has no decision to change. `weights/infantry-open-off.json` is the baseline with `infantry_open` alone set to nought, so a difference between two runs on this scenario is that column and nothing else. Change-Id: Ieb761b4208a8defc3b572899570bdb3062bbe2d0