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Use starpu_mpi_wait_for_all() in RUNTIME_sequence_wait()

Philippe SWARTVAGHER requested to merge pswartva/chameleon:bugfix/starpu_mpi_wait_for_all into master

Hello,

I had some random deadlocks, processes being blocked in RUNTIME_sequence_wait(). I think they come from the changes introduced in starpu_mpi_barrier() and starpu_mpi_wait_for_all(). So I corrected their use in Chameleon. I don't think we need to check the version of StarPU to apply this correction.

Please @furmento can you have a look on this PR, to be sure I didn't make any mistake ?

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