GGU-GEO-GRAPH: "Edit limit values + colours" menu item

This menu item is visible if value-dependent, colour-filled graphics were previously displayed. The limit values and colours for the visualised measured data can be edited. The dialog boxes correspond to the boxes that open for the appropriate menu items dealing with chart evaluations. They are therefore described in the menu item "Chart evaluation/Bars", "Value-dependent colour-fill" button, menu item "Chart evaluation/Tables", "Edit limit values" button and menu item "Chart evaluation/Symbols", "Discrete colour gradient" group box, "Colour + legend preferences" button.