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Description
Dropping support for deal.II versions prior to 9.6.0. The latest versions offers substantial improvements for matrix-free multigrid grid transfer. With the planned implementation for multigrid in PRISMS-PF v3.0 it is worthwhile to change the minimum version of deal.II.
Furthermore, our installation guides are being redone so that should help with installing deal.II 9.6.0 and later.
Checklist
Miscellaneous items that may need to be done when making a PR: