GGU-SLAB: File menu

• GGU-SLAB: "New" menu item
• GGU-SLAB: "Load" menu item
• GGU-SLAB: "Save" menu item
• GGU-SLAB: "Save as" menu item
• GGU-SLAB: "Import ASCII file" menu item
• GGU-SLAB: "Export as ASCII file" menu item
• GGU-SLAB: "Print output table" menu item
• GGU-SLAB: Selecting the output format
• GGU-SLAB: Button "Output as graphics"
• GGU-SLAB: Button "Output as ASCII"
• GGU-SLAB "Output preferences" menu item
• GGU-SLAB "Print and export" menu item
• GGU-SLAB "Batch print" menu item
• GGU-SLAB "Exit" menu item
• GGU-SLAB "1, 2, 3, 4" menu items