Add basic right management to forum. Need to test it!

core/models.py

@@ -204,6 +204,10 @@ class User(AbstractBaseUser):
             return False
         if group_id == settings.SITH_GROUP_PUBLIC_ID:
             return True
+        if group_id == settings.SITH_GROUP_SUBSCRIBERS_ID:
+            return self.is_subscribed()
+        if group_id == settings.SITH_GROUP_OLD_SUBSCRIBERS_ID:
+            return self.was_subscribed()
         if group_name == settings.SITH_MAIN_MEMBERS_GROUP: # We check the subscription if asked
             return self.is_subscribed()
         if group_name[-len(settings.SITH_BOARD_SUFFIX):] == settings.SITH_BOARD_SUFFIX: