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[localoperator] Add wrapper that extends volume-only local operator block-diagonal fashion

Steffen Müthing requested to merge feature/add-block-diagonal-lop-adapter into master

This MR adds a new class BlockDiagonalLocalOperatorFullCoupling, which takes an existing, volume-only operator and applies it to all leaf spaces in pair of (compatible) ansatz and test function space trees.

As the name implies, it will create a fully coupled matrix (including all cell-local off-diagonal entries).

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