Interlocked Rings

I took guru\'s very cool OpenSCAD file, cleaned it up, made it fully parametric, and fiddled with the parameters.

Specifically, the following parameters are different:
* I made the rings a bit thicker so the build quality is improved.
* The number of rings is now adjustable, and they are arranged in a circle.
* I played with the tilt of the rings and the distance between them so they didn\'t overlap. (necessary, since they are now bigger)
* The *tor* versions have had the cylinder sectio