fix for inq_dimlen() bug with unlimited dimensions on parallel I/O builds #2310
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Fixes #2038
Fix problem with length of unlimited dimensions for parallel I/O.
As pointed out by @wkliao, an MPI_Allreduce() call is required so that all processes know the maximum extent of the unlimited dimension.
This code is protected by ifdef blocks so it is not run for sequential builds.
@WardF this fix should probably be merged before the next release.