MekBay stamps its own build where MegaMek writes 0.51.00, and rewriting one as the other destroyed the only record of where a force came from. A file this crate authors writes MegaMek's, since that is what has to read it. CONFORMED_TO_MEGAMEK says which MegaMek the rules agree with, for storing beside a figure that outlives the session that computed it - a battle value kept without it cannot be told from one computed against another MegaMek. A test refuses to let it drift from what conformance.txt was measured against. Change-Id: I342a909f67b5dc9c0ae1d0ff2c5973ff106863c8