Changes:
- Default of `zero_weighted_kpoints` option has been changed from `keep` to `prefer`.
- `acceptor_charge` and `donor_charge` options have been merged into a single option,
`defect_charge`.
Enhancements:
- Added `--bands` option to `amset wave` to allow selecting specific band ranges.
Bug fixes:
- Fixed the calculation of ionized impurity concentration in bipolar materials and for
charge states != 1.
- Fixed the calculation of spin-orbit wave function overlaps.
- Fixed warning messages in extraction of wave function coefficients.
- Clarified `phonon_frequency` output.