[Vrs-development] Document Update

[Bill Lance]

I've added new material to the LDS Detail document.

I've added a section on InterModule communication. 
This formalizes the idea of the Cluster Image.  It
also starts the the framework of using Goldwater
methods as the communication tool.  I think that's
what Cluster Management Messages are alined with.

Also in the Repository section, I've refined the
Pointer Table model.  I think we have a clean
definition now that organizes the task as a RAID 10
device driver.  Of course, it's not running as a true
driver in the OS, but in user space.  However, it's
modeled as a device driver.  All isses of directory
organization and encryption are moved to overlaying
layers.   

I think this vastly simplyfies the data distribution
tasks.


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