Check if Etat are equals, or equals to String
Created by: grallm
Because Etat are only defined by their name they could be compared to a String This commit also allows to don't have same Etat in a HashSet
Nantes Université
Created by: grallm
Because Etat are only defined by their name they could be compared to a String This commit also allows to don't have same Etat in a HashSet