Support for link event, fix link not correctly deleted

gns3server/controller/__init__.py

@@ -151,7 +151,7 @@ class Controller:
         :param kwargs: See the documentation of Project
         """
         if project_id not in self._projects:
-            project = Project(project_id=project_id, **kwargs)
+            project = Project(project_id=project_id, controller=self, **kwargs)
             self._projects[project.id] = project
             for compute_server in self._computes.values():
                 yield from project.add_compute(compute_server)