Update the state of the model run to active.

        Raises an exception if update fails or resource is unknown.

        Returns
        -------
        ModelRunHandle
            Refreshed run handle.

def update_state_active(self):
        """Update the state of the model run to active.

        Raises an exception if update fails or resource is unknown.

        Returns
        -------
        ModelRunHandle
            Refreshed run handle.
        """
        # Update state to active
        self.update_state(self.links[REF_UPDATE_STATE_ACTIVE], {'type' : RUN_ACTIVE})
        # Returned refreshed verion of the handle
        return self.refresh()