Udft

Changed
- Fix `lib` usage.
- Fix `version_info`.
- Expose `get` and `set_lib`.

Added
- Add `valid_lib` function to have a list of valid library.

Changed
- Fix typing for `hnorm`.
- Remove `logging` module import
- Fix `hnorm` again
- Fix copyright date

Added
- Add scipy and activate parallelization by default.

Changed
- `lib` configuration.
- Fix hnorm

Changed

- Change the "norm" to "hnorm" for hermitian norm computation.
- Various fix.

Changed

Fix diff_ir 'axe' bug.

Changed

Numpy is the default implementation.