[mpi3-coll] [Mpi-22] Graph Interface Fixes

[Torsten Hoefler]

Hello again,
Jesper and me had some offline discussions. He found a bug in my code,
added consistent error checking and extended the example. Thanks!

The code looks fine to me and I attached the changed code to this mail.
Please check it for correctness.

All the Best,
  Torsten

-- 
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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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