Hirth Joint (Angle Adjustment Discs)

**Adjust an angle of two parts using a predefined amount of steps**
* Angle can be fixed using screws
* Using a bolt with a spring would allow the discs to be rotated but would snap them to certain angles (like a wheel of fortune")
* Customizable to make it fit for a lot of purposes
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Find also find this project (in the most recent version) on Github: https://github.com/speendo/HirthJoint
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Shoutouts to the friendly people on the [OpenSCAD-Mailinglist](http://rocklinux.net/mailman/listinfo/openscad) who helped me with a [difficult issue](http://forum.openscad.org/curved-surface-td8757.html) in this thing.
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[2014-07-07] Update: Added the option to cut the tips of the snaps which leads to trapezoids for high load couplings where minimal conversion of torosional force to axial force is important (suggested by @mechadense)
[2014-06-27] Update: Odd values for Snaps are also allowed
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Also see this Hirth Joint: http://www.thingiverse.com/thing:38729