Add a "nabu-capabilities" command line to check nabu capabilities
It would be good to have a CLI like nabu
check returning the following information:
- Can perform Cuda reconstruction: (check cuda/pycuda/scikit-cuda)
- Can perform OpenCL reconstruction: (check opencl/pyopencl)
- Can perform sinogram rings removal: (check pywavelets)
- Can perform cuda sinogram rings removal: (check pycudwt)
- ...
and offer some insight on why a feature is missing.
It would allow users to check why a given environment is "not working".