Additional features/possible extensions

[fgerick]

Additional features/possible extensions:

• Python interface (almost works out of the box with pyjulia)
• Implement Pseudo-Vacuum magnetic field basis for ellipsoid (Vidal & Cebron, 2021)
• Use Unitful.jl to let user decide how to non-dimensionalize the equations and for easy translation back into physical units.
• Allow for arbitrary equations to be modelled/easier interface to include other forces/terms