Reimplementing the PDE solver.

examples/simple-solver/CMakeLists.txt

examples/simple-solver/Makefile

examples/simple-solver/main.cpp

examples/simple-solver/simple-solver.cfg.desc

examples/simple-solver/simpleProblemConfig.h

examples/simple-solver/simpleProblemSolver.h

examples/simple-solver/simpleProblemSolver_impl.h

install

src/implementation/solvers/ode/tnlEulerSolver_impl.h

src/implementation/solvers/ode/tnlMersonSolver_impl.h

src/implementation/solvers/pde/tnlExplicitTimeStepper_impl.h

src/implementation/solvers/pde/tnlPDESolver_impl.h

src/implementation/solvers/tnlIterativeSolver_impl.h

src/implementation/solvers/tnlSolverConfig_impl.h

src/implementation/solvers/tnlSolverStarter_impl.h

src/solvers/ode/tnlExplicitSolver.h

src/solvers/pde/tnlExplicitTimeStepper.h

src/solvers/pde/tnlPDESolver.h

src/solvers/tnlDummyProblem.h

src/solvers/tnlIterativeSolver.h