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*.
