WIP: Feature/simplify effectivelaws - Do not merge!
Fixes #711 (closed) Fixes #710 (closed) Fixes #733 (closed)
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Depends on a fix in MPFA to handle zero coefficients.
This MR is outdated and superseded by !1684 (merged)
Edited by Timo Koch
Fixes #711 (closed) Fixes #710 (closed) Fixes #733 (closed)
This MR is outdated and superseded by !1684 (merged)