[FEATURE] add bspline
[FIX,PYOPENMS] fix tests
[TEST] add test for BSpline2d
[NOP] cleanup
[PYOPENMS,NOP] fixes, comments
[FEATURE] add additional wrappers
[FEATURE] wrap additional functions (raw pointers)
[FIX] remove mutable access functions without implementations
Merge pull request #1021 from hroest/feature/pyOpenMS_fixesAndWraps

Feature/py open ms fixes and wraps