avx512 version of SELL format, based on the SVE version

openmp-avx512/basic/Box.hpp

openmp-avx512/basic/BoxIterator.hpp

openmp-avx512/basic/BoxPartition.cpp

openmp-avx512/basic/BoxPartition.hpp

openmp-avx512/basic/CSRMatrix.hpp

openmp-avx512/basic/ComputeNodeType.hpp

openmp-avx512/basic/DotOp.hpp

openmp-avx512/basic/ELLMatrix.hpp

openmp-avx512/basic/FEComputeElem.hpp

openmp-avx512/basic/FusedMatvecDotOp.hpp

openmp-avx512/basic/GetNodesCoords.hpp

openmp-avx512/basic/Hex8_box_utils.hpp

openmp-avx512/basic/Lock.hpp

openmp-avx512/basic/LockingMatrix.hpp

openmp-avx512/basic/LockingVector.hpp

openmp-avx512/basic/MatrixCopyOp.hpp

openmp-avx512/basic/MatrixInitOp.hpp

openmp-avx512/basic/MatvecOp.hpp

openmp-avx512/basic/MemInitOp.hpp

openmp-avx512/basic/NoOpMemoryModel.hpp