Fixed a bug whereby completion propagation failed to operate correctly in transitional games
Fixed null ref crash in Breakthrough w/walls (edge factorization case)
Minor GC & Occupancy improvements

- Change depths to shorts.  (We aren't going to see games with tree depth > 32K.)
- Always re-use score arrays.
- Remove unused TreeNode field.
Merged 'develop'.

Conflicts:
	src/org/ggp/base/player/gamer/statemachine/sancho/TreeNode.java