#77 More 3Dish visualization of orbits

[omoroca]

For a better spatial reception of the orbits, it would be nice to visualize the nearer part a litter thicker than the more distant part of the orbit line. Furthermore, it would be very cool if I could switch the orbits to transparent discs instead of lines and to be able to see points of intersection of this disc with other orbits. This would help get a better idea where the comets cross into the planet orbits. In a 2D rendition on the screen, it's currently hard to see.