GGU-STABILITY: Slip body menu (for polygonal slip surfaces only)

GGU-STABILITY: "Info" menu item
GGU-STABILITY: "Define new" menu item
GGU-STABILITY: "Edit old" menu item
GGU-STABILITY: "Duplicate" menu item
GGU-STABILITY: "Edit" menu item
GGU-STABILITY: "Display" menu item
GGU-STABILITY: "Delete individually" menu item
GGU-STABILITY: "Delete all" menu item
GGU-STABILITY: "Logarithmic spiral" menu item
GGU-STABILITY: "Animation" menu item (General wedge method and Vertical slice method only)
GGU-STABILITY: "Move slip body" menu item (General wedge method and Vertical slice method only)