Feature/interpolation

Interpolation between grids, initial version. Added traversal over irregular elements and gitlabci tests

enabled an automatic merge when the pipeline for 8554254d succeeds

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• bc541924 - Update .gitlab-ci.yml

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• b909d646 - changed cmake to prevent compiling of std::variant examples if no variant is available

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• 7cb044c3 - corrected pipline errors

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• 398e8216 - corrected pipline errors

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• 36330f0c - corrected pipline errors

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• 953de00e - corrected pipline errors

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• d6f3e0e0 - corrected pipline errors

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• 8ca9a701 - solved some more compiler problems

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• fc1cd1d3 - interface changed in gridfactory

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• 30d13103 - interface changed in gridfactory

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• e9a2f31c - interface changed in gridfactory

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• d02e17dc - interface changed in gridfactory

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• d17b7a5d - interface changed in gridfactory

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• dc791b13 - removed some warnings

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• 639d762d - updated gitlab-ci.yml for test dune-git version

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• 94bab4a6 - dune 2.6 can not used forEachLeafNode

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• c7def655 - dune 2.6 can not used forEachLeafNode

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merged

mentioned in commit 0af88a98