[export] Fixed: the scope aggregator (accompanying course) group by

period's scope (and the label didn't show this)

+ extract ScopeRepository and create ScopeRepositoryInterface

src/Bundle/ChillMainBundle/Repository/ScopeRepositoryInterface.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Chill\MainBundle\Repository;
+
+use Chill\MainBundle\Entity\Scope;
+use Doctrine\ORM\QueryBuilder;
+use Doctrine\Persistence\ObjectRepository;
+
+interface ScopeRepositoryInterface extends ObjectRepository
+{
+    public function createQueryBuilder($alias, $indexBy = null): QueryBuilder;
+
+    public function find($id, $lockMode = null, $lockVersion = null): ?Scope;
+
+    /**
+     * @return Scope[]
+     */
+    public function findAll(): array;
+
+    /**
+     * @return Scope[]
+     */
+    public function findBy(array $criteria, ?array $orderBy = null, $limit = null, $offset = null): array;
+
+    public function findOneBy(array $criteria, ?array $orderBy = null): ?Scope;
+
+    public function getClassName(): string;
+}