...build 72
fix up parsing of nbt-tag dat in templates, esp. for entities
add .73 release
remove water from default skippables blocks list.  Updates #132
remove a bunch of other blocks from 'skippables' list that should not
have been there (clay, ores, others...)
add item to test world-gen ability of a particular structure
clean up some of the debug output for structure gen failure.
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
re-add npc-mount-horse functionality to command baton guard/move command
a bit of prep/layout work on structure-gen towns
bit more layout work on towns system.  need to test area selection and
validation on real worlds.  need to figure out border-corner fill/cut
operations.
remove grass block from skippables blocks list -- it is -not- skippable
lots more work on town generation.  have selection, border, leveling,
and walls working well for this stage in development.  need to begin
working on structure packing algorithm for actual generation of
structures.
implement basic road laying for main-road in town
work on enabling template use for wall generation - need to finalize
wall format
add a couple of test wall pieces for town-gen.  fix orientation of
corner piece to match that of wall piece (starting NW corner, generating
clockwise... NW - N - NE - E - SE - S - SW - W ...)
separate out border/leveling, wall, and road logic to own classes.  add
test houses for town gen.  clean up test wall pieces