Implements reduction: min/max #2263

Job	Run time
build (--disable-openmp, --with-yaml, --enable-deprecated-io)	10m 42s
build (--disable-openmp, --with-yaml, --disable-deprecated-io)	10m 0s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	11m 53s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	11m 31s
build (--enable-mixed-mode, --with-yaml, --enable-deprecated-io)	12m 50s
build (--enable-mixed-mode, --with-yaml, --disable-deprecated-io)	11m 33s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	10m 53s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	12m 15s
build (--disable-setting-flags, --with-yaml, --enable-deprecated-io)	12m 18s
build (--disable-setting-flags, --with-yaml, --disable-deprecated-io)	10m 48s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	12m 19s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	10m 30s
build (--with-mpi=no, --with-yaml, --enable-deprecated-io)	4m 29s
build (--with-mpi=no, --with-yaml, --disable-deprecated-io)	4m 56s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	5m 6s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	3m 58s
	2h 36m 1s

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