Add MPI level shared file timing data (similar to posix)
Today we have "BY_SLOWEST" fields for POSIX timing data, we should add the same for the MPI timing counters. This requires a log format change to add new fields.
Today we have "BY_SLOWEST" fields for POSIX timing data, we should add the same for the MPI timing counters. This requires a log format change to add new fields.