Reduced amount of background images

The backgrounds images 4-9 didn't look clear in play. Reduced down to
the first 4, and changed code accordingly. May add more later.
Goliath balance changes

Goliath speed up a little, HP up, ToHit up and ToDefend up
Removed Prints
New Healer AI and Balance
Dragon Bug Fixes

Drake didn't have a chartype.

The Dragon.py mod is due to a weird bug. Apparently runningTo, in some
circumstances, can be None (which was then picked up in pathfinding)