Selection change and additional work on digging...



Trying to make digging work a bit more nicely with multiple units. Also
trying to make digging work a bit more nicely in general, and possibly
be able to work with multiple people.

Also changed selection so that it allows you to select more units without
great hatred (change of movement) for currently selected units. :D

Signed-off-by: Ashe York <asheyork@gmail.com>
Quite a bit more elegant digging...



Which allows for multiple units to dig! I think that multiple players will
still need some work, but we can also cross that bridge when getting this
ready for an actual release. Yay!

Signed-off-by: Ashe York <asheyork@gmail.com>
Removal of debug messages! Oops.



Forgot to remove them last commit.

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