Arbitrary coil shape

[jboguski]

Currently there are only circular loop in available in the azimuthal direction. could different coil geometries be implemented? This would require created a 3D, as opposed to axisymmetric geometry and analysis tools.

[eepeterson]

There certainly aren't any show-stoppers in adding it to the code and it would be a great feature to have. The couple things that need to be thought about when adding this are:

1.) How do you want to interface with the data? What is your ideal structure from a user perspective?
2.) Storing a 3D data brick with 3 B field components gets very memory intensive if you want good resolution.

Happy to provide any feedback on this. If you want to take a stab at it, open a pull-request when you've got something you want me to take a look at.