read_conserve_remap to read the xgrid for conservative interpolation #1357

Job	Run time
build (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Release)	6m 25s
build (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Debug)	2m 47s
build (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	2m 56s
build (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	6m 56s
build (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	6m 32s
build (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Release)	6m 22s
build (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	2m 52s
build_arm (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	2m 59s
build_arm (-DOPENMP=on, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	7m 6s
build_arm (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Debug)	2m 59s
build_arm (-DOPENMP=on, -DCMAKE_BUILD_TYPE=Release)	6m 58s
build (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Debug)	2m 47s
build_arm (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Debug)	3m 9s
build_arm (-DOPENMP=off, -DCMAKE_BUILD_TYPE=Release)	6m 55s
build_arm (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Debug)	3m 2s
build_arm (-DOPENMP=off, -DWITH_YAML=on, -DCMAKE_BUILD_TYPE=Release)	7m 21s
	1h 18m 6s

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