Issue17/starpu tags

Fix issue #17 (closed) and uses starpu_mpi_comm_get_attr when available.

@furmento, @thibault can you please also have a look on this one. thanks.

added 7 commits

• f7482918...bd9b8f15 - 6 commits from branch solverstack:master
• 4b37543d - Fix issue #17 (closed)

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added 3 commits

• 4b37543d...41849647 - 2 commits from branch solverstack:master
• 0e793439 - Fix issue #17 (closed)

Compare with previous version

looks good to me.

merged

mentioned in commit 5ea33ef2