Use node_startloc table to figure out where robots are physically
located initially, instead of using location_info for current location
and initial.

	* tbsetup/ptopgen.in: When adding features for nodes attached to a
	building (e.g. robots), pull the building names from node_startloc
	instead of location_info.  This change lets the robots exist in
	two different areas.

	* tbsetup/ns2ir/parse-ns.in: Pull building names from
	node_startloc instead of location_info.