shift+click on blocks of samples in Configure menu

[avilella]

Hi,

Even with the limit described in #52 , I am making use of Degust for csv files with dozens, sometimes close to 100-150 samples, which I try to name and sort appropriately to ease the selection of classes.

If would be great if the dropdown menu for sample selection had shift+click capability to select groups of samples in a couple of clicks. E.g. click on the first sample, scroll down, shift+click on the last sample of the group, and have all the others in between selected.

I hope that's something doable without too much disruption to the codebase.

Thx