Add doxygen comment for DATA_OVERRIDE_INIT_IMPL_ #138

Job	Run time
build (--disable-openmp, --with-yaml, --enable-deprecated-io)	5m 35s
build (--disable-openmp, --with-yaml, --disable-deprecated-io)	5m 29s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	5m 35s
build (--disable-openmp, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	5m 33s
build (--enable-mixed-mode, --with-yaml, --enable-deprecated-io)	5m 8s
build (--enable-mixed-mode, --with-yaml, --disable-deprecated-io)	5m 33s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	5m 34s
build (--enable-mixed-mode, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	5m 33s
build (--disable-setting-flags, --with-yaml, --enable-deprecated-io)	5m 32s
build (--disable-setting-flags, --with-yaml, --disable-deprecated-io)	5m 34s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	5m 35s
build (--disable-setting-flags, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	5m 35s
build (--with-mpi=no, --with-yaml, --enable-deprecated-io)	1m 59s
build (--with-mpi=no, --with-yaml, --disable-deprecated-io)	2m 0s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --enable-deprecated-io)	2m 0s
build (--with-mpi=no, --enable-test-input=/home/unit_tests_input, --disable-deprecated-io)	2m 0s
	1h 14m 15s

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