[Dev] Mine / Not-Mine implementation

[Morgen Sagen]

When a user subscribes to a shared collection, they will be given the  
option to either add the imported items into their "My items"  
collection, or to keep those items out of "My items".  Anyone  
interested in giving input to how to implement the notion of "Mine /  
Not-Mine", please see:

http://wiki.osafoundation.org/bin/view/Journal/MorgenSagen20050901