iData/estruct: linkdata method

[farhi]

to update plot automatically when object changes.
This works by setting e.g. the XDataSource on 'lineseries' and 'surfaceplot' plots.
see example:

• https://fr.mathworks.com/matlabcentral/answers/463553-how-to-update-plot-data-manually.
• https://fr.mathworks.com/help/matlab/ref/refreshdata.html

It works with the variable name, on many plot types, but not all.

[farhi]

In addition, an event listener can detect when axes change, to keep pixel density constant over plots:
See

• https://fr.mathworks.com/matlabcentral/answers/92886-how-do-i-create-a-callback-function-which-gets-executed-whenever-the-xlim-value-of-axes-changes

This would allow to replot the object with a reducevolume(nb_pixels) on the x/y/z/limits of the axes and have a constant object size to plot, event when initial data is very large.