Update grid.cc #508

Job	Run time
testmode ON / classicmode_1d_3dgrid	20m 24s
testmode ON / classicmode_3d	22m 22s
testmode ON / kilonova_1d_1dgrid	10m 5s
testmode ON / kilonova_1d_3dgrid	10m 38s
testmode ON / kilonova_2d_2dgrid	18m 0s
testmode ON / kilonova_2d_2dgrid_barnesthermalisation	16m 29s
testmode ON / kilonova_2d_2dgrid_expansionopac	13m 36s
testmode ON / kilonova_2d_2dgrid_xcomgammaphotoion	15m 13s
testmode ON / kilonova_2d_3dgrid	19m 48s
testmode ON / nebular_1d_3dgrid	25m 25s
testmode ON / nebular_1d_3dgrid_limitbfest	27m 50s
testmode ON / combine_checksums	0s
	3h 19m 50s

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