Tweaks for updating the robotmap:

	* robots/emc/emcd.c: Only send updates to loclistener when the
	position actually changes.

	* robots/emc/loclistener.in: Listen for SETDEST events and update
	the destination position in the nodes table.  Also update the
	orientation column.

	* robots/emc/test_emcd.config, robots/emc/test_emcd.sh.in: Update
	for changes elsewhere.