Modify_STI_end

This function is used to modify stiffener ends. A stiffener group is picked within an active panel. One of the ends is modified to stop at either a line or an existing component. As for the Split_STI function the component can be any component on the panel that a stiffener end can connect to or it can be another intersecting panel. A third option is to pick the panel boundary in which case the stiffener will end at the panel edge.