Break calculated deco info to separate vars

Store the calculated values in separate variables in the plot_data
struct, and display them separate. This makes sure we don't confuse the
calculated values with the ones from a dc, and now we can compare the
two.

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Remove duplicated SAC data from information overlay

When reordering the info overlay content to make it jump around less,
somehow the SAC data got printed twice.

[Dirk Hohndel: rewrote incorrect commit message]

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>