GGU-SLAB: System menu

• GGU-SLAB: "Info" menu item
• GGU-SLAB: "Units + project identification" menu item
• GGU-SLAB: "Slab material" menu item
• GGU-SLAB: "Beam material" menu item
• GGU-SLAB: "Test" menu item
• GGU-SLAB: "Analyse" menu item
• GGU-SLAB: Bandwidth optimisation/equation solver selection
• GGU-SLAB: Analysis using the subgrade reaction modulus method
• GGU-SLAB: Analysis using the constrained modulus method
• GGU-SLAB: "Reinforce slab" menu item
• GGU-SLAB: "Foundation levels" menu item
• GGU-SLAB: "Preconsolidation" menu item
• GGU-SLAB: "Ground level" menu item