Plot all active orbitals in one view
For CASSCF calculations we need to investigate the active space orbitals and choose the orbitals for the next active space.
A first step in improving this workflow would be to implement a viewer.Viewer method that automatically plots all the active space orbitals of a calculation, together with some important data (i.e. occupancy etc.).
Although useful on its own, it could then be used in the future to implement an interactive setting-up of a follow-up calculation.