NF: linear registration for streamlines and bundles of streamlines
NF: added nbundle descriptors
Added init files in test directories
Updated setup.py with the bundle module
Added init file for module
RF: cleanup
RF: remove visualization from tests
more cleanup
RF: refactoring the rigid streamline registration class
NF: added function for rigid registration of bundles
TEST: testing rigid registration and matrix composition
Vectorize streamlines
Implemented other algorithms apart from Powell's method
Testing convergence with Newton-CG
Added option for L_BFGS_B
Added normalized version of BMD
Added division by 1/4 to make the BMD relate to mm when sqrt(BMD) is used
An attempt to make BMD faster
Speedup seems working giving 4X speedup
Using OpenMP gives me a 5X speedup