Since upgrading to iPhoto6 I have a lot of what look like extra folders in ther Pictures/iPhoto Library folder. This is typical of what is included in all the folders. Are these necessary or can I trash them. The Originals folder appears to contain the actual pictures. The picture is too small for some to read, but basically all the folders at the top are labled by year,month, etc., end up with a Data folder containing an xxxx.attr file. Are these left over from the iPhoto upgrade, and can they be deleted?