How do I create a "master Vault" in Aperture 2 stored on an external HD. I have over 30,000 photos in iPhoto but when i want to do some fine editing i like to import them over to aperture 2, do the editing then print export whatever. For some reason i now have 3 vaults on my external HD all name something different. is there a way i can merge all the vaults? thanks in advance..