Updated shape spec

[Keith Packard]

Matthias Clasen noticed that the shape spec was lacking the verbage
needed to describe the new input region. I've attempted to rectify this
with the enclosed document. Errors and confusion should be reported back
so I can fold them into a preliminary commit to the repository.

I also stuck my own copyright back on the file. That felt good.   
-- 
keith.packard at intel.com
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