Issue 116

116 connective stuff to describe the key binding ID 
 
I am tending towards the idea that the key binding id is essentially
random.
 
The reason for this is that we do not have the type of assertion
envelope that would support use modes where the binding id is
persistent. Also this would tend to establish the key binding as a
credential type in its own right rather than as an interface structure.
 
For example someone uses CMP to register a key then XKMS to revoke it,
what does the keybinding id mean in the query??
 
Also we can have many key binding elements for one single underlying
virtual keybinding...
 
        Phill