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Large hdf5 reads

Matthieu Schaller requested to merge large_hdf5_reads into master

In the on-going series of i/o fixes here is the latest set of changes.

Basically, applying the same trick as for the writes. If we attempt to read more than 2GB, we break the read up into smaller pieces. You can reach that regime when using the EAGLE-50 on a 4 nodes or less but that is a rather extreme setup.

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