minor cleanups to PO trader AI
finish cleanup of empty waypoints on trade orders item
reset all flags in PO trader AI when finished with shelter codepath,
should ensure trader kicks back into routing mode properly
minor cleanup stuff
change 'disable wander' setting to completely disable most AI -- needs
custom implementation in each AI, so that they may be disabled
independently (such as follow player is -not- disabled).  Closes #96
Merge branch 'master' into import_table_models

Conflicts:
	src/main/java/net/shadowmage/ancientwarfare/npc/ai/NpcAICourier.java