WIP: Fix/sequential buckleylev mcworther analytical sol

Closed Timo Koch requested to merge fix/sequential-buckleylev-mcworther-analytical-sol into master

Reopening of !2608 (merged) which has been reverted in !2627 (merged) due to bug #1034 (closed). Should be revisited preferably in the light of #869 (closed) and !2629 !2628

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