Info menu

• "Copyright" menu item
• "Maxima" menu item
• "Help" menu item
• "Test slab reinforcement" menu item
• "Test vibrodisplacement compaction" menu item
• "Rotate all" menu item
• "GGU on the web" menu item
• "GGU support" menu item
• "What's new?" menu item
• "Language preferences" menu item
• "Benchmark" menu item (constrained modulus method only)