New features
------------
- Sobol' indices on a 2D map with :func:`visualization.mesh_2D`, *by Robin Campet*,
- Stacking and coloring option for :class:`visualization.Kiviat` with
keywords ``stack_order`` and ``cbar_order``, *by Pamphile Roy*,
- MST criteria with :func:`space.Space.mst`, *by Pamphile Roy*,
- :mod:`visualization.density` for moment independant sensitivity
measures, *by Pamphile Roy*,
- COSI indices :func:`uq.cosi`, *by Pamphile Roy*,
- :class:`space.gp_sampler.GpSampler`, *by Matthias De Lozzo*.
- :class:`surrogate.Mixture` to construct mixture of expert models,
by *Remi Macadre*,
- :class:`functions.DbGeneric` to sample from a generic dataset.
Enhancements
------------
- Ensure sample/data pairs on reading, *by Pamphile Roy*,
- :class:`surrogate.SurrogateModel` I/O consistency, *by Pamphile Roy*,
- Different options for discrepancy computation (MD, WD), *by Pamphile Roy*,
- Sobol' indices polar visualization with keyword ``polar``, *by Pamphile Roy*,
- Refactor :class:`pod.Pod`, *by Pamphile Roy*.
Bug fixes
---------
- Driver with multifidelity, *by Pamphile Roy*,
- Hypercube for refinement, *by Pamphile Roy*,
- POD averaging, *by Pamphile Roy*.