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Remove obsolete write access to amg grid levels

Oliver Sander requested to merge remove-obsolete-amglevel-access into master

The UG3 multigrid data structure used to have an array 'amggrids' with grid levels for AMG. That array is long gone, but it was still overwritten with nullptrs in the multigrid setup code. A serious memory bug, and I am amazed that nobody ever observed any effects.

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