PCP pump - improved code

This is a recreation of my old
"Progressing Cavity Pump (cycloidical)" model
http://www.thingiverse.com/thing:28237
with slight modifications keeping physical backward compatibility.
plus methods to calculate the exact throughput based on pump geometry and drive frequency.

## dependencies:
https://github.com/lsuess/scad-lib-cyclogearprofiles

## motivation:
1) It's a good usage example for the new library
http://www.thingiverse.com/thing:777936
2) compatibility - for the people who already have printed an instance from the old code
3) reverse engineering of the old code was needed to calculate the pumps throughput.
**some math with these pumps:**
https://cloud.sagemath.com/projects/673e5d6c-1ece-46f0-818d-dc7e2e0e6358/files/Moineau%20Pump%20Math.sagews
If you spot some errors in there (very probable)
I'd hghly appreciate it if you'd notify me about them.


## Note:
If you **stack a left and a right version together and put an inlet part inbetween** yo