Mechanism to add "internal" notes and attach files

[GoogleCodeExporter]

This capability is available today by using an "internal user" document that 
allow people to enter notes and upload files and then only give internal 
parties access to the document, but we're looking for a simpler mechanism for 
straightforward needs.

Would like a way to include notes and upload files to any document/transaction 
without having them become available to other parties. It should record who 
created the note and when, and allow those with access to see the historical 
notes and any attachments, but without requiring the party view the attachments 
or the like.

This is just a simple way to add annotations to documents after the fact.

Original issue reported on code.google.com by yoz...@gmail.com on 30 Apr 2013 at 10:56