[mpi3-coll] Graph Interface Fixes

[Torsten Hoefler]

Hello Group,
I finished a first implementation which maps the newly proposed graph
interface to the old interface. 

This implementation is probably suboptimal and of course not scalable
(can't be because the old interface isn't ;)). But is should be
functional (compiles and works with some toy examples). 

I also corrected a slight mistake in ticket #33. As usual, I am open for
comments. I CC'd the mpi-2.2 mailinglist because I think that might be
of interest for the discussions next week.

Best,
  Torsten

-- 
 bash$ :(){ :|:&};: --------------------- http://www.unixer.de/ -----
Torsten Hoefler       | Research Assistant
Open Systems Lab      | Indiana University    
150 S. Woodlawn Ave.  | Bloomington, IN, 474045, USA
Lindley Hall Room 135 | +01 (812) 855-3608
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