Tests

Bump to C++14 and remove deprecated unary_function, binary_function #414

Job	Run time
build_go (1.21, ubuntu-latest)	47s
test_go (1.21, ubuntu-latest)	1m 2s
build_go (1.21, macos-latest)	38s
build_cpp (ubuntu-latest, g++)	1m 37s
integ (1.22)	2m 19s
build_go (1.22, ubuntu-latest)	49s
test_go (1.21, macos-latest)	34s
build_cpp (ubuntu-latest, clang++)	25s
build_go (1.22, macos-latest)	32s
test_go (1.22, ubuntu-latest)	46s
build_cpp (macos-latest, clang++)	28s
test_go (1.22, macos-latest)	42s
test_cpp	31s
	11m 10s

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