This is a usability issue:
- reduce number of required mouse clicks
- simplify editing of numeric fields (currently the format check is a pain)
- add tooltips wherever useful
- fix scale entry format (must be float with dec sep . )
- implement the contour location combobox
- show the plot number in the settings dialog title
Examples:
- labels: remove the radio buttons. Add a button "Restore default". Empty label is equivalent to "off" button.
- suppress 3D options in 2D plots