change `value` to `mpp_ival` and `mpp_rval` #73

Job	Run time
build (--disable-openmp, --with-yaml)	13m 10s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input)	13m 36s
build (--enable-mixed-mode, --with-yaml)	14m 56s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input)	16m 3s
build (--disable-setting-flags, --with-yaml)	12m 44s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input)	13m 41s
build (--with-mpi=no, --with-yaml)	5m 35s
	1h 29m 45s

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