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Implicit-explicit splitting

Bernd Flemisch requested to merge feature/implicit-explicit-splitting into splitting

Avoid reassembling the diffusion matrix and use a linear PDE solver for the diffusion part. Allow for an explicit treatment of the reaction part.

Add a preprocessor switch EXPLICIT_REACTION to switch between explicit and implicit treatment of the reaction part. Define two corresponding tests test_implicit_reaction and test_explicit_reaction.

To avoid reassembling the diffusion matrix, the branch feature/assemble-matrix-only-once of Dumux has to be used.

Edited by Bernd Flemisch

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