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Adaptive mesh refinement for DG

See merge request !524

Fixing warnings for nightly.

See merge request !525

GKB merge

See merge request !505

Revert "Revert "[DG AMR] Tests to ensure that PDE solutions are identical regardless of whether macro- or micro-refinement is applied (P1 and DG tests).""

This reverts commit 68b5fe52.

Revert "[DG AMR] Tests to ensure that PDE solutions are identical regardless of whether macro- or micro-refinement is applied (P1 and DG tests)."

This reverts commit 6279f04c.

[DG AMR] Tests to ensure that PDE solutions are identical regardless of whether macro- or micro-refinement is applied (P1 and DG tests).

[DG AMR] Necessary functionality for AMR in VolumeDoFFunction. This especially includes various indexing functions that convert micro-face/cell indices between macro-primitive levels. Also implements proper ghost-layer allocation.

[DG AMR] Extending VolumeDoF PackInfos for AMR (2D + direct only for now). Required changes to buffered communicator, too.