Added P1 k_mass (scaled mass) with and without icosahedral shell blending.

generate/requirements.txt

operators.toml

operators/CMakeLists.txt

operators/k_mass/CMakeLists.txt

operators/k_mass/P1ElementwiseKMass.cpp

operators/k_mass/P1ElementwiseKMass.hpp

operators/k_mass/P1ElementwiseKMassIcosahedralShellMap.cpp

operators/k_mass/P1ElementwiseKMassIcosahedralShellMap.hpp

.../P1ElementwiseKMassIcosahedralShellMap_apply_macro_3D.cpp

...hellMap_computeInverseDiagonalOperatorValues_macro_3D.cpp

operators/k_mass/avx/P1ElementwiseKMass_apply_macro_2D.cpp

operators/k_mass/avx/P1ElementwiseKMass_apply_macro_3D.cpp

...seKMass_computeInverseDiagonalOperatorValues_macro_2D.cpp

...seKMass_computeInverseDiagonalOperatorValues_macro_3D.cpp

.../P1ElementwiseKMassIcosahedralShellMap_apply_macro_3D.cpp

...hellMap_computeInverseDiagonalOperatorValues_macro_3D.cpp

...ElementwiseKMassIcosahedralShellMap_toMatrix_macro_3D.cpp

...ators/k_mass/noarch/P1ElementwiseKMass_apply_macro_2D.cpp

...ators/k_mass/noarch/P1ElementwiseKMass_apply_macro_3D.cpp

...seKMass_computeInverseDiagonalOperatorValues_macro_2D.cpp