public void load(DataInputStream dis) throws IOException {
//Reconstitution des sections
int nSections = dis.readShort();
for(int i=0; i<nSections; i++){
Section section = new Section();;
section.load(dis);
this.addSection(section);
}
//Reconstitution des connexions entre sections
for(int i=0; i<nSections; i++){