[WIP] Migrate code from CHrlS98/aodf_toolkit

[CHrlS98]

Quick description

Migrate code from https://github.com/CHrlS98/aodf-toolkit back into scilpy.

Code from my MSc project.

To run,

scil_compute_asymmetric_odf.py --disable_angle input.nii.gz output.nii.gz

• disable_angle speeds up the computation and is good enough.

@arnaudbore

Type of change

Check the relevant options.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Provide data, screenshots, command line to test (if relevant)

...

Checklist

• My code follows the style guidelines of this project (run autopep8)
• I added relevant citations to scripts, modules and functions docstrings and descriptions
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I moved all functions from the script file (except the argparser and main) to scilpy modules
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[arnaudbore]

Build passed ! Good Job 🍻 !

[arnaudbore]

Build passed ! Good Job 🍻 !

[CHrlS98]

See #925. I'm closing this one.