Element segment directions and commands to invert them

[Laszlo Nagy]

We had a discussion in another thread

http://archicad-talk.graphisoft.com/viewtopic.php?t=52415

and two wishes came from it:

1. We should be able to see on every element the direction of their segments (clockwise or counter-clockwise) just like in case of Reference Lines of Walls and Beams.
2. We should have commands to invert this direction in case it is needed (just like in case of Wall Reference Lines).