Implementation of PrivateNotes feature

[Emmacho]

Ability to create and later examine private notes on the document that the other party cannot see.

This feature would work as follows:
-The current user could annotate any text they see; by default, such notes would by default be private to them.
-Any notes the user has previously entered could be made visible via the HideShowDetails feature. A small unobtrusive icon might appear in the user’s view of the text if there is a hidden note.
-Optionally, an author could make any note visible to other users in the same party, or even to the other parties. Business rules and security constraints (such as approval being needed from the chief negotiator) would have to be developed to ensure that private notes are not accidentally revealed to the other party.