Added preliminary armour data.

But broke everything else.
Balanced factions for choosing random

Having factions with different numbers of units for random makes for
lopsided Random, since I *believe* it chooses a random faction, *then* a
random unit.  Now all factions have 3, 4, or 5 units, so the distribution
is much more similar.  Beginners will be more likely to get a useful unit
rather than a difficult to play unit, as well.