Added test for new reparametrization function
Added test for new reparametrization function

I also cleaned up some of the tests and started
simplifiying bspline creation with a helper function.

Closes #668

DLR-SC/tigl,DLR-SC/tigl,DLR-SC/tigl,DLR-SC/tigl,DLR-SC/tigl,DLR-SC/tigl