resume: list associated persons sorted by household. add method in entity

src/Bundle/ChillPersonBundle/Controller/AccompanyingCourseController.php

@@ -118,6 +118,7 @@ class AccompanyingCourseController extends Controller
         return $this->render('@ChillPerson/AccompanyingCourse/index.html.twig', [
             'accompanyingCourse' => $accompanyingCourse,
             'withoutHousehold' => $withoutHousehold,
+            'participationsByHousehold' => $accompanyingCourse->actualParticipationsByHousehold(),
             'works' => $works,
             'activities' => $activities
         ]);