Scripts: Better help pages
Scripts: Better help pages

- Paragraph formatting mimicing that of the binaries.
- For options with a corresponding argument, print the type of data expected.

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3