Here's what the version numbers were for v1.5.3:
Here's what I think they should be for v1.5.4 -- can someone sanity check me?
--> None of the C MPI API calls have changed (which is what we defined as the only interfaces that matter here), but some internal code did change.
--> No interface or code changes (same number as v1.5.3)
--> Minor fixes to some logic, but no interfaces changed
--> New (correct) interfaces for MPI_SCATTERV were added. The old (incorrect) interfaces were kept for ABI reasons.
--> The app_idx change breaks compatibility with older versions
--> The DDT changes break compatibility with older versions
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