Alright, kind of fixing #1, and groups of units!

Sets base interior to grass, to minimize stuck units.
Also, Tanks and Hoverturrets use my sort of 'battalion' system, allowing
you to make groups of dudes.  Combine with the power of the emergent
grouping when arriving somewhere, it really does look like a battalion
of dudes.  Select tool can still select individual units, too.  Should
allow you to break off a weak unit from your battalion to get healed or
something like that, in the future.