feat: [WIP] support [email protected] headers

[sbstndb]

This is a WIP.

Description

Adaption to the new tree xtensor folder structure.
TODO : add conditional macros to support older xtensor versions

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[sbstndb]

At this point, I have to

• solve the HighFive xtensor issue (mpi-mamba)
• solve the cppcheck issue (it enforces me to always use the old include path even if it uses [email protected]
• ensure compatibility for all demos

[sbstndb]

The H5 error comes from :

#ifdef XTENSOR_VERSION_MAJOR
#ifndef H5_USE_XTENSOR
#define H5_USE_XTENSOR
#endif
#endif

#ifdef H5_USE_XTENSOR
#include <xtensor/xarray.hpp>
#include <xtensor/xtensor.hpp>
#include "xtensor.hpp"
#endif

That always includes xtensor headers in HighFive in our project.
I sould try to override the value XTENSOR_VERSION_MAJOR