The info under the price chart should pertain to that date

[sebbacon]

The current version on the staging site shows the DT status as of the last dm+d import, rather than the date of the analysis.

Alternatively, we could always show a recent import but make it clear that this is the case.

[sebbacon]

Per #27, we do need to flag drugs which were NP8 at the time, however.

I suggest the following:

• We import DT information as was correct at the time of the analysis into its own table. These are available here
• On the "possible savings" info page (the one with the graph) we highlight things that were NP8. We can also highlight where this has changed