Compare tanks

Everything a side-by-side comparison of 2 to 4 columns renders (?slugs=is-7,e-100): each vehicle's specifications, module combinations, equipment slots, crew and progression, plus its server-average performance. The mountable catalogues (equipment, directives, consumables, crew skills) are hoisted out of the vehicles and described once under catalog, referenced by key, and ranges carries the catalogue-wide spread of every characteristic so a client can score a vehicle per category. A slug may suffix the game client to read the vehicle on (?slugs=amx-13-90,amx-13-90@ct), which is how a vehicle is compared against what the running Common Test makes of it, and every column carries back the client it was read on. It may also suffix a position (?slugs=is-7,is-7~2), which is how the same vehicle is compared under two setups: both columns carry the vehicle's data, told apart by occurrence. A repeat spelled the same way twice still collapses, and a slug the catalogue doesn't know is dropped rather than failing the request, as long as two columns remain.