Simplify code using asMatrix()

This is based on dune-common!656 (merged) which introduces Impl::asMatrix() using this we can avoid many Hybrid::ifElse constructions which increase complexity of the implementation and error messages. Furthermore we can drop toMatrix() which fixed #63 (closed).

This is a clone of !288 (closed). Is was created in order to tell the CI to use the corresponding branch in dune-common using a matching branch name.

mentioned in merge request !288 (closed)

added 1 commit

• 894a39a4 - Simplify BTDMatrix::solve() using Impl::asMatrix() and Impl::asVector()

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unmarked as a Work In Progress

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assigned to @oliver.sander

Merging, thanks!

mentioned in commit 85fce383

merged