Used OpenRobotStateTable()/CloseRobotStateTable() for all the foot-bot devices. Added a flag to know whether to remove a table when it has no contents in the Lua Qt model. Added foot-bot distance scanner. Changed the default size of the space hash.
Merge branch 'master' of https://github.com/ilpincy/argos3

Conflicts:
	src/testing/experiment/test_footbot_lua.xml