modification des interfaces dans les contraintes de placement
cleaning configurationsUtils
Merge branch 'master' of
https://github.com/julien-marchand/BestPlace.git

Conflicts:
	src/main/java/gipad/placementconstraint/Ban.java
	src/main/java/gipad/placementconstraint/Gather.java
	src/main/java/gipad/placementconstraint/PlacementConstraint.java
	src/main/java/gipad/placementconstraint/Spread.java
Merge branch 'master' of https://github.com/julien-marchand/BestPlace.git