Update gammapkt.cc #7308

Job	Run time
classicmode_1d_3dgrid	4m 25s
classicmode_3d	8m 16s
kilonova_1d_1dgrid	4m 46s
kilonova_1d_3dgrid	5m 11s
kilonova_2d_2dgrid	6m 38s
kilonova_2d_2dgrid_barnesthermalisation	5m 25s
kilonova_2d_2dgrid_expansionopac	5m 3s
kilonova_2d_2dgrid_xcomgammaphotoion	2m 29s
kilonova_2d_3dgrid	6m 47s
nebular_1d_3dgrid	11m 35s
nebular_1d_3dgrid_limitbfest	13m 56s
classicmode_1d_3dgrid testmode ON	15m 33s
classicmode_3d testmode ON	23m 42s
kilonova_1d_1dgrid testmode ON	10m 39s
kilonova_1d_3dgrid testmode ON	11m 11s
kilonova_2d_2dgrid testmode ON	18m 38s
kilonova_2d_2dgrid_barnesthermalisation testmode ON	17m 8s
kilonova_2d_2dgrid_expansionopac testmode ON	14m 59s
kilonova_2d_2dgrid_xcomgammaphotoion testmode ON	4m 23s
kilonova_2d_3dgrid testmode ON	19m 32s
nebular_1d_3dgrid testmode ON	25m 21s
nebular_1d_3dgrid_limitbfest testmode ON	28m 29s
combine_checksums	16s
	4h 24m 22s

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