def update_owned_instance(self, controllable):
        if self.owner:
            self.owner.update_owned_instance(controllable)
        super(Controllable, self).update_owned_instance(controllable)
If this (acting as a controller) is itself controlled, forward the
dataset/ETHPy150Open lsaffre/lino/lino/modlib/gfks/mixins.py/Controllable.update_owned_instance