[cleanup] Deprecate gcd/lcm, advertise C++17 STL solution

This is used by dune/common/lcm.hh. That looks like it could be deprecated in favor of std::lcm at the same time (and just call that instead of Dune::Gcm).

done

I suggest to also drop the implementation and tests and just have Dune::Gcd forwards to std::gcd as well.

done

added 2 commits

• 35cf2f07 - [cleanup] Deprecate gcd, advertise C++17 STL solution
• d7fdcf7f - [cleanup] Deprecate lcm and advertise C++17 STL solution

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added 1 commit

• c1d0f85d - [cleanup] Remove test for deprecated gcd/lcm functions

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added 3 commits

• 0c54202b - [cleanup] Deprecate gcd, advertise C++17 STL solution
• 365ca384 - [cleanup] Deprecate lcm and advertise C++17 STL solution
• eafd23b9 - [cleanup] Remove test for deprecated gcd/lcm functions

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assigned to @ansgar

changed title from [cleanup] Deprecate gcd, advertise C++17 STL solution to [cleanup] Deprecate gcd/lcm, advertise C++17 STL solution

added cleanup label

enabled an automatic merge when the pipeline for eafd23b9 succeeds

merged

mentioned in commit d5af0301

mentioned in merge request !826 (merged)