Merge branch 'feature/reconstruction' into feature/kinetic-schemes

src/language/utils/EmbeddedDiscreteFunctionMathFunctions.cpp

src/output/OutputNamedItemValueSet.hpp

src/output/VTKWriter.cpp

src/scheme/DiscreteFunctionDPkVariant.hpp

src/scheme/DiscreteFunctionP0Vector.hpp

src/scheme/DiscreteFunctionVariant.hpp

src/scheme/FluxingAdvectionSolver.cpp

src/scheme/PolynomialReconstruction.cpp

tests/test_PolynomialReconstruction.cpp