Debuging the explicit heat-equation solver.

examples/heat-equation/heatEquationSolver.h

examples/heat-equation/heatEquationSolver_impl.h

examples/heat-equation/tnl-heat-equation.cpp

examples/heat-equation/tnl-run-heat-equation-eoc-test

examples/heat-equation/tnlHeatEquationEocRhs.h

src/functions/tnlTestFunction.h

src/implementation/functions/tnlSinWaveFunction_impl.h

src/implementation/functions/tnlTestFunction_impl.h

src/implementation/matrices/tnlMatrixSetter_impl.h

src/implementation/mesh/tnlGrid1D_impl.h

src/implementation/mesh/tnlGrid2D_impl.h

src/implementation/mesh/tnlGrid3D_impl.h

src/implementation/mesh/tnlTraversal_Grid1D_impl.h

src/implementation/mesh/tnlTraversal_Grid2D_impl.h

src/implementation/mesh/tnlTraversal_Grid3D_impl.h

src/implementation/solvers/pde/tnlExplicitTimeStepper_impl.h

...mplementation/solvers/pde/tnlLinearSystemAssembler_impl.h

src/implementation/solvers/pde/tnlPDESolver_impl.h

...lementation/solvers/pde/tnlSemiImplicitTimeStepper_impl.h

src/mesh/tnlGrid.h