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[HM] remove Kpu_k

Florian Zill requested to merge FZill/ogs:HM_remove_dkde into master

As @wenqing correctly pointed out in !3341 (merged) the additional strain derivative of the permeability introduces more computation time than it is worth in terms of the Jacobian accuracy. I did some tests of the model and without additional term the simulation was about 10% faster. It may slightly increase the convergence behaviour, but my models had no problem without it.

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