read_conserve_remap to read the xgrid for conservative interpolation #1361

Job	Run time
build_arm (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Release)	4m 55s
build_arm (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	3m 4s
build_arm (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Release)	4m 55s
build (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Debug)	2m 45s
build_arm (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	1m 46s
build_arm (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Debug)	2m 56s
build_arm (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	1m 54s
build (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	4m 52s
build_arm (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	3m 9s
build_arm (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Debug)	3m 0s
build (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Release)	2m 17s
build (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Release)	1m 38s
build (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	2m 51s
build (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	4m 51s
build (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Debug)	1m 46s
build (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	1m 24s
	48m 3s

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