Orbital class

[zerothi]

There is currently no way of dealing with eigenvectors of eigenstates.

To be able to create real-space grids one needs some way of describing the orbital. For this an exact methodology of creating orbital classes may be required:

i.e. (see e.g. wiki: https://en.wikipedia.org/wiki/Atomic_orbital)

• Hydrogen like orbital
• Slater-type orbital
• Gaussian type orbital

[zerothi]

Possibly also consider superposition of orbitals, e.g wannier?

[zerothi]

This requires quite a bit more work so it will be post-poned to 0.9.0

[zerothi]

This is being developed in the orbital branch.

[zerothi]

Finally added in a9a35f7