Boundary menu

• "Preferences" menu item
• "Check" menu item
• "Individual potentials" menu item
• "(Potentials) In section" menu item
• "(Potentials) Linear" menu item
• "Point sources" menu item
• "Linear sources" menu item
• "Diffuse sources" menu item
• "Diffuse sources for soils" menu item
• "Individual soils" menu item
• "(Soils) In section" menu item
• "Define pipes" menu item
• "Delete pipes" menu item
• "Individual blankets" menu item (only for "leaky aquifer")
• "(Blankets) In section" menu item (only for "leaky aquifer")
• "(Blankets) Linear" menu item (only for "leaky aquifer")