Update atomic.h #7208

Job	Run time
classicmode_1d_3dgrid	4m 40s
classicmode_3d	7m 50s
kilonova_1d_1dgrid	4m 57s
kilonova_1d_3dgrid	4m 52s
kilonova_2d_2dgrid	6m 34s
kilonova_2d_2dgrid_barnesthermalisation	5m 24s
kilonova_2d_2dgrid_expansionopac	5m 8s
kilonova_2d_2dgrid_xcomgammaphotoion	5m 16s
kilonova_2d_3dgrid	7m 42s
nebular_1d_3dgrid	11m 46s
nebular_1d_3dgrid_limitbfest	13m 50s
classicmode_1d_3dgrid testmode ON	15m 53s
classicmode_3d testmode ON	23m 18s
kilonova_1d_1dgrid testmode ON	10m 17s
kilonova_1d_3dgrid testmode ON	11m 4s
kilonova_2d_2dgrid testmode ON	18m 37s
kilonova_2d_2dgrid_barnesthermalisation testmode ON	16m 22s
kilonova_2d_2dgrid_expansionopac testmode ON	14m 37s
kilonova_2d_2dgrid_xcomgammaphotoion testmode ON	15m 34s
kilonova_2d_3dgrid testmode ON	19m 21s
nebular_1d_3dgrid testmode ON	25m 21s
nebular_1d_3dgrid_limitbfest testmode ON	27m 59s
combine_checksums	23s
	4h 36m 45s

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