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Blockstructured Preconditioner

Marcel Koch requested to merge feature/blockstructured-preconditioner into master

This implements a additive two level preconditioner for blockstructured grids. The coarse grid is solved directly with SuperLU. On the fine grid either a Schur complement solver with Neumann-Neumann preconditioner or a simple Jacobi preconditioner can be used.

This fixes the CI compared to !380 (closed).

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