issue #1: synchronise programs' schedules and later diffusions (update, delete); fix signal import in apps

aircox_cms/apps.py

@@ -1,5 +1,9 @@
 from django.apps import AppConfig
 
+class AircoxCMSConfig(AppConfig):
+    name = 'aircox_cms'
+    verbose_name = 'Aircox CMS'
+
+    def ready(self):
+        import aircox_cms.signals
 
-class CmsConfig(AppConfig):
-    name = 'cms'