Make sure to order data by timestamp when plotting by timestamp

[dougthor42]

Need to verify that inserting data out of timestamp order still gets plotted correctly (eg, gets plotted in timestamp order).

• Plot by timestamp order with timestamp X axis.
• Plot by timestamp order with datapoint ID X axis.

These two would probably just lead to confusion and should not be included. If people really want them, then they can pull out the data manually and plot it.

• Plot by datapoint ID order with datapoint ID X axis.
• Ploy by datapoint ID order with timestamp X axis.