Created by: portnov
It appears there is "standard" implementation of B-Spline approximation in the SciPy library. And this algorithm is, in fact, more powerful comparing to one implemented by Geomdl library:
- It can generate closed curves
 - It gives you control of how smooth you want the curve to be; you can set smoothing factor to zero to have interpolation instead of approximation.
 - It allows you to provide different weights for different points.
 
Mk2 of the node now has "Implementation" parameter, to select from these two implementations.
Preflight checklist
Put an x letter in each brackets when you're done this item:
- 
Code changes complete.  - 
Code documentation complete.  - 
Documentation for users complete (or not required, if user never sees these changes).  - 
Manual testing done.  - 
Unit-tests implemented.  - 
Ready for merge.  
