[example] cahn hilliard including full model
Similar intent as example of !3380 (merged) implementing a nonlinear model with two equations.
Parallel should work with e.g. DUMUX_NUM_THREADS=1 mpirun -np 4 ./example_cahn_hilliard
(multi-threaded assembly will not help much because the main time is the solver, could try different solver with !3386 (merged) or the solver factory).
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Add example description and doc generator
Edited by Timo Koch