GGU-TIME-GRAPH: Description of menu items

GGU-TIME-GRAPH: File menu

GGU-TIME-GRAPH: Hydrographs menu

GGU-TIME-GRAPH: Contours menu

GGU-TIME-GRAPH: Section menu

GGU-TIME-GRAPH: Graphics preferences menu

GGU-TIME-GRAPH: Page size + margins menu

GGU-TIME-GRAPH: Info menu