read_conserve_remap to read the xgrid for conservative interpolation #1364

Job	Run time
build_arm (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Release)	7m 8s
build_arm (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Release)	6m 56s
build_arm (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	7m 38s
build_arm (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Debug)	2m 57s
build_arm (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	3m 4s
build_arm (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	3m 3s
build (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Debug)	2m 43s
build_arm (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Debug)	3m 8s
build (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	6m 35s
build (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Release)	6m 22s
build_arm (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	7m 10s
build (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Release)	6m 25s
build (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Debug)	2m 47s
build (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	2m 53s
build (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	2m 57s
build (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	6m 37s
	1h 18m 23s

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