clean up NPC medic AI -- it should now properly heal things.  Updates
#128
Merge branch 'master' into import_table_models

Conflicts:
	src/main/java/net/shadowmage/ancientwarfare/npc/ai/NpcAIMedic.java
actually clean up medic AIs in response to #128  
Medic ais should actually work, for both player owned and faction npcs.
fix up max-health override not working.  Updates #129