I've migrated my Aperture library to Photos, and now have two libraries. Before y'all shout at me, I know they are not taking up double the space (due to the use of hard links). However, the space-management apps I use (e.g. Grandperspective and Apple's own) don't know that, and it's annoying me. Provided I never want to use Aperture again, can I just delete the old library? Cheers!