#703 Show depend_? data in Display Data dialog

[Ivar Christopher]

• As an example, start with two rank-1 datasets, each with epoch as depend_0. Longitude and latitude, for instance.

• Plot them against each other (x vs. y plot).

• Use the Display Date right click functionality to display a range of data.

• The dialog gives the option to display the longitude and the latitude, but there is no way to display the underlying epoch for each. It would be very useful to be able to do so.