main component improvement
Merge branch 'new_conc' of https://github.com/jbarreau/RobotNBoxes into new_conc

Conflicts:
	src/implementation/EnvironementImpl.java
	src/interfaces/IRobotEnvironement.java
	src/objet/Position.java
Merge branch 'new_conc' of https://github.com/jbarreau/RobotNBoxes into new_conc

Conflicts:
	src/implementation/EnvironementImpl.java
	src/interfaces/IGUIEnvironement.java