Writting documentation and refactoring DenseMatrix.

Documentation/Examples/Matrices/CMakeLists.txt

...ples/Matrices/DenseMatrixExample_Constructor_init_list.cu

...es/Matrices/DenseMatrixExample_getCompressedRowLengths.cu

...tion/Examples/Matrices/DenseMatrixExample_getConstRow.cpp

...Examples/Matrices/DenseMatrixExample_getElementsCount.cpp

...mentation/Examples/Matrices/DenseMatrixExample_getRow.cpp

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

src/TNL/Containers/Segments/BiEllpack.hpp

src/TNL/Containers/Segments/ChunkedEllpack.hpp

src/TNL/File.hpp

src/TNL/Matrices/DenseMatrix.h

src/TNL/Matrices/DenseMatrix.hpp

src/TNL/Matrices/DenseMatrixRowView.h

src/TNL/Matrices/DenseMatrixRowView.hpp

src/TNL/Matrices/DenseMatrixView.h

src/TNL/Matrices/DenseMatrixView.hpp

src/TNL/Matrices/MatrixView.h

src/TNL/Matrices/MatrixView.hpp

src/TNL/Matrices/SparseMatrix.h

src/UnitTests/Matrices/DenseMatrixTest.h