GGU-DRAWDOWN: "Define automatically" menu item

Instead of manually compiling the individual drawdowns to a section they can be compiled automatically using this menu item. The section is compiled in the same sequence that the drawdown points were defined. A message box opens giving information on the number of nodes used and the section can be visualised after closing the message box by clicking "Yes". The section course legend is also displayed in this case. If the section visualisation needs to be changed, go to the menu item "Section/Point section preferences" and make the necessary changes.