seg_to_coords is massively slower with demba_allen_seg_dev_mouse_p15_20um compared to allen_mouse_25um

[PolarBean]

seg to coords with the first atlas look 2m 27 seconds and with the second it took 5 minutes and 8 seconds.

• this should be replicated to ensure its not a one of
• test whether the atlas resolution has an effect on the running of this function