Writting documentation and refactoring DenseMatrix.

Documentation/Examples/CMakeLists.txt

Documentation/Examples/Matrices/CMakeLists.txt

...les/Matrices/DenseMatrixExample_Constructor_init_list.cpp

...ples/Matrices/DenseMatrixExample_Constructor_init_list.cu

...s/Matrices/DenseMatrixExample_getCompressedRowLengths.cpp

...es/Matrices/DenseMatrixExample_getCompressedRowLengths.cu

...tion/Examples/Matrices/DenseMatrixExample_setElements.cpp

...ation/Examples/Matrices/DenseMatrixExample_setElements.cu

src/TNL/Containers/Array.h

src/TNL/Matrices/DenseMatrix.h

src/TNL/Matrices/DenseMatrix.hpp

src/TNL/Matrices/DenseMatrixView.hpp

src/TNL/Matrices/SparseMatrix.h

src/TNL/Matrices/SparseMatrix.hpp

src/UnitTests/Matrices/DenseMatrixCopyTest.h

src/UnitTests/Matrices/DenseMatrixTest.h