GGU-SETTLE: "Define multi-node section" menu item

It is possible to visualise the computed, user-defined settlements graphically as a settlement depression. A user-defined section can be specified using this menu item. Left-click the required settlement points, displayed on the screen. If settlement values have not yet been calculated it is, of course, not possible to define a section. After defining the section, visualisation of the settlement depression can be achieved using the menu item "Evaluation/Display settlements in section".