Added a new TCP/IP based supervisor controller to Webots

Modified the server-cpp code to be used as a tcp/ip based supervisor controller capable to reset the simulation.
It only understands 3 commands: 'R' --> reset simulation
                                'Q' --> quit simulation
				'P' --> reset simulation physics

Also added a supervisor node to the webots world, controlled by the new controller

Changes to be committed:
	new file:   ../robotworker.cpp
	new file:   ../robotworker.h
	new file:   ../server-supervisor-cpp.cpp
	new file:   ../server-supervisor-cpp.pro
	new file:   ../sockethandler.cpp
	new file:   ../sockethandler.h
	modified:   ../../../worlds/khepera-braitenberg-2-HOMEO.wbt