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Replace deprecated std::unary_function

Erik Quaeghebeur requested to merge equaeghe/trojita:remove-unary_function into master

std::unary_function has been deprecated since C++11 and removed in C++17. A standard way to replace it in code is to explicitly list the member typedefs (see, e.g., https://stackoverflow.com/a/33115140 for std::binary_function), which is what is done in this commit. This makes the code future-proof and removes a lot of warnings when compiling.

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