Store received message data when hierarchy level decrements

[roy-harmon]

If results for an order are received and then an order or patient frame is received, the results for the previous order (and all other data received before the current frame) should be permanently stored. See CLSI-LIS2-A2 page 30 (Figure 2) for more details. At the moment, results are only stored once the message's terminator frame is received.