Fixing setup of the boundary conditions.

examples/advection/advectionProblem.h

examples/advection/advectionProblem_impl.h

examples/inviscid-flow/1d/eulerProblem.h

examples/inviscid-flow/1d/eulerProblem_impl.h

examples/inviscid-flow/2d/eulerProblem.h

examples/inviscid-flow/2d/eulerProblem_impl.h

src/TNL/Functions/FunctionAdapter.h

src/TNL/Functions/MeshFunction.h

src/TNL/Functions/MeshFunction_impl.h

src/TNL/Operators/DirichletBoundaryConditions.h

src/TNL/Operators/NeumannBoundaryConditions.h

src/TNL/Operators/NeumannBoundaryConditions_impl.h

src/TNL/Problems/HeatEquationEocProblem.h

src/TNL/Problems/HeatEquationEocProblem_impl.h

src/TNL/Problems/HeatEquationProblem.h

src/TNL/Problems/HeatEquationProblem_impl.h

src/TNL/Solvers/PDE/PDESolver_impl.h

src/TNL/Solvers/SolverStarter_impl.h

src/UnitTests/CMakeLists.txt

...ks/heat-equation-benchmark/HeatEquationBenchmarkProblem.h