local size of pio aggregated data should not exceed 2GiB

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@jedwards4b is already working on this.

Since Dec 4, 2017.

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Description

Due to a bug in ROMIO with the fix proposed https://github.com/pmodels/mpich/pull/2888
the total contiguous size of data cannot exceed 2GiB. I propose adding this as a limit in PIO
until the fix in ROMIO is widely available.

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