mixed precision: add test for coupler_types and data_override changes #204

Job	Run time
build (--disable-openmp, --with-yaml)	14m 17s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input)	14m 17s
build (--enable-mixed-mode, --with-yaml)	14m 9s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input)	14m 17s
build (--disable-setting-flags, --with-yaml)	14m 17s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input)	14m 16s
build (--with-mpi=no, --with-yaml)	5m 42s
	1h 31m 15s

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