Wishlist from last disk++ meeting

[datafl4sh]

• Make Intel MKL optional
• Make the whole library C++17 compatible, if C++20 is needed enable it by application
• Make MUMPS optional. Review Disk++ mumps interface.
• Try to read directly GMSH .msh files in order to have only one GMSH input function
• Refactor viscoplasticity application and remove old code folder
• Put in the correct place the script med2poly.py
• Verify and fix GMSH output if exists
• Make VTK export to support Paraview
• Implement new basis function infrastructure for vector and matrix bases
• @gdelay and @romainmottier can go ahead with the integration of their code

[datafl4sh]

Linear solvers: if PARDISO and MUMPS are not available fall back to Eigen SparseLU. Give the possibility to the user to choose the linear solver via an enum parameter.