def move_discovery_to_front(self, data):
        """
        Moves the discovery triplet to the front of the reading list.
        Leaves everything else in the same order.
        """
        readings = self.get_readings(data)
        discovery_index = self.get_discovery_index(data)

        reordered_readings = (readings[discovery_index:discovery_index + 3] +
                              readings[:discovery_index] +
                              readings[discovery_index + 3:])

        self.set_readings(data, reordered_readings)
Moves the discovery triplet to the front of the reading list.
        Leaves everything else in the same order.