A simple and vital confirmation Pop Up for the Delete DataNode function

[sabriboughanmi]

I just deleted a DataNode with a lot of manual configuration when trying to clone it.
Adding an Undo/Redo feature will also be very interesting.

for the moment everything seems good to me.
Thanks!

[Tr0sT]

Added confirmation popup for deleting.
Undo/Redo is a pleasant feature, but I don't have time to implement it right now.