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Mark overridden functions with 'override'
New versions of clang (here: Apple LLVM version 7.0.0 (clang-700.0.72)) warn (-Winconsistent-missing-override) for functions that override but are not marked as such. I think that this is a good practice that should be adopted and even be put in Contributing.md.
Currently we have tons for such warnings. I might fix them peu à peu.