Numgrid

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Released on 2021-05-27.

- Add Krack-Köster radial grid (`radial_grid_kk`).
- Rename `radial_grid` to `radial_grid_lmg`.
- Make it possible to evaluate LMG grid by basis set name
(`radial_grid_lmg_bse`).

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Released on 2021-05-23.

- Better error message for invalid inputs to angular_grid.
- Improve package metadata.

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Released on 2021-01-04.

- Test and build also for Python 3.9.
- Export also __version__.

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Released on 2021-01-03.

The API changed for easier maintenance and simpler use:

- No initialization or deallocation necessary.
- One-step instead of two steps (since the radial grid generation time is
negligible compared to space partitioning, it did not make sense anymore to
separate these steps and introduce a state).
- ``alpha_min`` is given as dictionary which saves an argument and simplifies
explaining the API.
- The library now provides Rust and Python bindings. It used to provide C and
Fortran bindings. The C/Fortran code lives on on the `cpp-version branch
<https://github.com/dftlibs/numgrid/tree/cpp-version>`__. I might bring the
C interfaces back into the Rust code if there is sufficient interest/need.
- Note that the API will probably change again as soon as support for more
quadratures is added (see `issue 43
<https://github.com/dftlibs/numgrid/issues/43>`__).

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Released on 2020-08-14.

- Unpin version dependencies for Numpy and CFFI.

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Released on 2020-04-09.

- Build warning removed.
- Add .zenodo.json.