When I first started using Aperture instead of iPhoto, I elected to keep my iPhoto photos in their existing location (as referenced files) and all subsequent photos that were imported into Aperture were (obviously) managed by Aperture.
I am hoping to start freeing up some hard drive space by deleting some photos.
 If I delete a referenced photo in Aperture, does the photo also get deleted in iPhoto, or does the reference to it merely get deleted from Aperture? I'm assuming the latter is true. If I delete the photo in iPhoto, I'm guess in a preview thumbnail remains in Aperture.
So, what's the best way to accomplish this?
 I'm ultimately hoping to get a new MacBook Pro and am thinking since I'm now an Aperture aficionado, I'd like to move all my photos to aperture as managed files since I might ultimately put my burgeoning photo collection on an external drive.
Is there a way to change the referenced iphoto files to managed Aperture files (thereby completely bypassing iPhoto altogether)?
Thanks for your help!