Out-of-bounds access in MaterialsProperties when AMR decreases the DOF

[stvdwtt]

If AMR is set such that the DOF decreases during the simulation (e.g. with "coarsen_after_beam" set to true), an out-of-bounds access can occur in MaterialsProperties::set_state when accessing the liquid and powder ratios. I believe this is because the MaterialsProperties is using an outdated mesh. I'm not sure if it is the internal DofHandler that is out of sync or something else. Simply calling MaterialProperties::reinit_dofs before MaterialsProperties::set_state isn't sufficient.

In other cases with AMR, it is unclear if the behavior is correct or not (but it doesn't trip the out-of-bounds exception).