add Enable collaboration menu item; pep8 cleanup
add Enable collaboration menu item; pep8 cleanup

walterbender/turtleart,AlanJAS/turtleart,walterbender/turtle3D,walterbender/turtleconfusion,walterbender/AmazonasTortuga,walterbender/turtleartmini,walterbender/turtleflags