Stop using deprecated scipy namespaces

[nicolascedilnik]

A certain number of scipy.ndimage namespaces are deprecated, this PR ensures future-proofness.

[loli]

Thank you for the contribution!

A short check revealed that there are few places where the syntax has not been changed yet:

./bin/medpy_fit_into_shape.py:from scipy.ndimage.interpolation import zoom
./bin/medpy_resample.py:    img = scipy.ndimage.interpolation.zoom(img, zoom_factors, order=args.order)
./bin/medpy_binary_resampling.py:from scipy.ndimage.interpolation import zoom
./bin/medpy_resample.py:import scipy.ndimage.interpolation
./medpy/filter/image.py:from scipy.ndimage.interpolation import zoom

Since they are all about the same method, I assume you left them out on purpose. Could you highlight why?

Then there are two places where private functions are used:

./medpy/features/intensity.py:from scipy.ndimage._ni_support import _get_output
./medpy/filter/image.py:from scipy.ndimage._ni_support import _get_output

I assume that these still require the old syntax. Correct me if I am wrong.

Once the first point has been clarified, I'll merge.

[nicolascedilnik]

Thanks for the prompt review. The reason I had not changed the others is because I missed them (they are in scripts I don't use), but I agree, it's worth changing too, hence my force push.

About the private functions, I would not touch them, but I guess it would be better not to import anything private. Now I guess you had good reasons for importing them, but I would say that is a different issue?

[loli]

You are quite right about the private function. That's a matter for another issue. Thank you again!