Add allow_overwrite to Result.save. #2683

Job	Run time
Create Example List	8s
Run Example: (fluorescence)	1m 41s
Run Example: (transient-absorption)	1m 25s
Run Example: (transient-absorption-two-datasets)	1m 23s
Run Example: (spectral-constraints)	1m 33s
Run Example: (spectral-guidance)	1m 28s
Run Example: (two-datasets)	1m 34s
Run Example: (sim-3d-disp)	1m 27s
Run Example: (sim-3d-nodisp)	1m 29s
Run Example: (sim-3d-weight)	1m 31s
Run Example: (sim-6d-disp)	1m 31s
Run Example: (doas-beta)	1m 27s
Compare Results	0s
	16m 37s

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