Point set alignment

I was trying to execute the example in `ITK_Example05_PointRegistration.ipynb` with the same data. Despite this, my code has been running for a really long time (>3 hours). After generating a keyboard interrupt, there are some numbers (gradients, time of execution etc.) which makes it look like something is done.

Now, I have tried to use the generated transform parameter file to transform the set of fixed points and register it with the moving point set. This gives me an empty `outputpoints.txt` file. Are there any suggested fixes to this?