Debuging the heat equation EOC test.

TODO

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

src/implementation/functions/tnlSinWaveFunction_impl.h

src/implementation/matrices/tnlMatrixSetter_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

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

src/matrices/tnlMatrixSetter.h

src/operators/tnlDirichletBoundaryConditions.h

tests/unit-tests/matrices/tnlSparseMatrixTester.h

...unit-tests/operators/diffusion/tnlLinearDiffusionTest.cpp

tests/unit-tests/operators/tnlPDEOperatorEocTestResult.h

tests/unit-tests/operators/tnlPDEOperatorEocTestSetter.h

tests/unit-tests/operators/tnlPDEOperatorEocTester.h

tests/unit-tests/tnlApproximationError.h

tests/unit-tests/tnlApproximationError_impl.h