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Flexible Multigrid Solver Implementation

  • Add FlexibleMultigridSolver class that allows arbitrary cycling i.e. takes in a list of inputs for cycle structure, smoother types, relaxation weights, etc.
  • Add SolverType enumeration for existing solvers/smoothers.
  • Add template argument in FullMultigridSolver class, to choose between a GeometricMultigridSolver or FlexibleMultigridSolver.
  • Add an app '2024-parthasarathy-mgoptimisation' to demonstrate these flexible cycles.

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