Error dialogue for trying to interpolate in wrong plot window

[J.D. Laurence-Chasen]

Currently it’s not obvious to new users that they must be in 2D or 3D points plot window for CTRL/CMD + I to bring up interpolation. If you press CTRL+I, for example, in the reprojection error plot, nothing happens. I suggest either:

a) Bring up a dialogue saying something like “You must be in 2D or 3D Positions plot to set interpolation”

or

b) Shift the user to 2D positions (or 3D if interpolation in 3D is set) automatically when they press CTRL/CMD + I in the wrong window.

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Thanks!

[Benjamin Knorlein]

fixes #225 : Added a dialog which informs the user and allows to directly change to the 2d position plot

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