New features
------------
- Add a ``fill`` option in :class:`visualization.Kiviat`, *by Pamphile Roy*,
- Add ``bounds`` option in visualization settings, *by Pamphile Roy*,
- :class:`visualization.Kiviat` automatically used by driver if dim > 4, *by Robin Campet*,
- Allow duplicate points in :class:`space.Space`, *by Pamphile Roy*.
Enhancements
------------
- Visualization settings taken into account for PDF, legend outside, *by Pamphile Roy*,
- Refactor :class:`space.Space` error handling, *by Pamphile Roy*,
- Documentation reorganization, *by Jean-Christophe Jouhaud*.
Bug fixes
---------
- :class:`visualization.Kiviat` filling and ordering, *by Pamphile Roy*,
- Maths in documentation as PNG, *by Pamphile Roy*,
- Projection strategy in :class:`surrogate.PC`, *by Pamphile Roy*,
- Circular imports from :func:`functions.utils.multi_eval`, *by Sophie Ricci*,
- Variance in LOO Q2, *by Romain Dupuis*,
- :class:`surrogate.PC` restart with *LS* strategy, *by Andrea Trucchia*.