Customizable Planetary Gearset (Cycloidical)

**caution:** The code needs to be updated to use the new library:
http://www.thingiverse.com/thing:777936

## See instructions for some practical info.
A bit about some hidden logic in planetary gears:
Not every combination of tooth numbers allows to distribute the planets equally around the circumference. If the combination allows equal (equiangular) distribution it can be that the planets are a multiple of the minimal mounting distance away from one another (they are not maximally closely packed) making the assembly weaker than it could be.
To allow more tooth number combinations and have the planets as closely/tightly packed as possible the planets can be organised in groups (which is done here). For this the greatest common divisor of the gear teeth numbers defines the number of planet groups (starting points for filling). The number of sun and planet teeth is then defined by multiplicators to that common divisor.
The cycloidical shape of the teeth allows (and requires