Refactoring the explicit solver updater.

.gitignore

CMakeLists.txt

examples/heat-equation/heatEquationSolver_impl.h

src/implementation/mesh/tnlTraversal_Grid1D_impl.h

src/implementation/mesh/tnlTraversal_Grid2D_impl.h

src/implementation/mesh/tnlTraversal_Grid3D_impl.h

...lementation/operators/diffusion/tnlLinearDiffusion_impl.h

...mentation/operators/tnlDirichletBoundaryConditions_impl.h

src/implementation/solvers/pde/tnlExplicitUpdater_impl.h

src/implementation/solvers/tnlSolverStarter_impl.h

src/operators/diffusion/tnlLinearDiffusion.h

src/operators/tnlDirichletBoundaryConditions.h

src/solvers/pde/tnlExplicitUpdater.h

tools/src/tnl-time-series2png

tools/src/tnl-view.h