Refactoring operators - setMatrixElements method.

src/operators/CMakeLists.txt

...ar-diffusion-operators/tnlFiniteVolumeNonlinearOperator.h

...ffusion-operators/tnlFiniteVolumeNonlinearOperator_impl.h

src/operators/diffusion/tnlLinearDiffusion.h

src/operators/diffusion/tnlLinearDiffusion_impl.h

src/operators/diffusion/tnlNonlinearDiffusion_impl.h

src/operators/diffusion/tnlOneSidedMeanCurvature.h

src/operators/diffusion/tnlOneSidedNonlinearDiffusion.h

src/operators/tnlDirichletBoundaryConditions.h

src/operators/tnlDirichletBoundaryConditions_impl.h

src/operators/tnlNeumannBoundaryConditions.h

src/operators/tnlNeumannBoundaryConditions_impl.h

src/solvers/pde/tnlLinearSystemAssembler.h

tests/benchmarks/heat-equation-benchmark/BenchmarkLaplace.h

...enchmarks/heat-equation-benchmark/BenchmarkLaplace_impl.h