GGU-SLAB: FEM mesh menu

• GGU-SLAB: "Preferences" menu item
• GGU-SLAB: "FEM mesh" menu item
• GGU-SLAB: "Outline" menu item
• GGU-SLAB: "Define (FEM) nodes" menu item
• GGU-SLAB: "Change (FEM nodes)" menu item
• GGU-SLAB: "Move (FEM nodes)" menu item
• GGU-SLAB: "Edit (FEM nodes)" menu item
• GGU-SLAB: "Array" menu item
• GGU-SLAB: Select type of array
• GGU-SLAB: Button "Regular"
• GGU-SLAB: Button "Irregular"
• GGU-SLAB: "Circular slab, …" menu item
• GGU-SLAB: "Manual (FEM) mesh" menu item
• GGU-SLAB: "Automatic (FEM mesh)" menu item
• GGU-SLAB: "Round off (FEM mesh)" menu item
• GGU-SLAB: "Delete (FEM mesh)" menu item
• GGU-SLAB: "Optimize (FEM mesh)" menu item
• GGU-SLAB: "Diagonals" button
• GGU-SLAB: "Topology" button
• GGU-SLAB: "Align (FEM mesh)" menu item
• GGU-SLAB: "Refine individually" menu item
• GGU-SLAB: "Section" menu item
• GGU-SLAB: "All" menu item