Deprecate the DUNE_ASSERT_AND_RETURN macro

Summary

The macro DUNE_ASSERT_AND_RETURN was introduced due to a shortcoming in some old compilers to allow assert() directly in constexpr functions. This is valid since c++14 and all minimal required compiler versions support this. So, the macro DUNE_ASSERT_AND_RETURN is useless and even leads to issues with static code analyzers. It should not be used anymore!

Note

There is still a test for this macro. Thus, when compiling the testsuite there will be a warning raised.

• Fix warning in testsuite

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• 94feacb0 - Disable deprecation warning in tests

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marked the checklist item Fix warning in testsuite as completed

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mentioned in commit e4bf440b

merged