[mpi3-coll] Updated scalable collectives proposal

[Torsten Hoefler]

Hi all,

I updated the scalable collectives proposal with the comments received
at the last reading and other comments received offline. See

https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/264

We will discuss this in tomorrow's Collective & Topologies Working
Group. Please check the proposal for correctness.

Thanks & Best,
  Torsten

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Torsten Hoefler         | Performance Modeling and Simulation Lead
Blue Waters Directorate | University of Illinois (UIUC)
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