Touch of polish on digging...



So that one doesn't 'Mine()' mobs, who don't have that proc. Instead,
that'll end up being Attack() perhaps. Anyway, that's fixed! :D
Added simple ownership icon...



This way, you can tell at a glance which troops are yours. I imagine it
is useful in every way, and if it isn't, feel free to tell me so I can
remove it/modify it.

Signed-off-by: Ashe York <asheyork@gmail.com>