Adding new classes - AnalyticSolution, NeumannBoundaryCondition, DirichletBoundaryCondition, LinearDiffusion, RightHandSide, TimeFunction, ZeroRightHandSide
Updating classes (implementation of partial derivations) - SinWaveFunction, ExpBumpFunction, SinBumpsFunction
Updating classes (modifying and adding new methods) - SimpleProblemSetter, SimpleProblemSolver
Modifying - simple-solver.cfg.desc

Adding solver monitor to the navier-stokes example.

Implementing tnl-diff.

Fixing the navier-stokes example.

Fixing the simple solver example.

Fixing parameters of operators to meet conventions and to allow compilation to be passed. Adding conversion from int to Real type in CSRMatrix to work with QuadDouble.