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Take into account ghost information when copying arrays

Yohann Bearzi (Kitware) requested to merge yohann.bearzi/vtk:handle_ghostarrays_during_copy into master

In general distributed arrays are assumed to have consistent values but this is not true for ghost arrays. This change fixes using the best ghost array value from a set of input ghost arrays for an output ghost array. The DIYAggregateDataSet test demonstrates the failure before this fix and passes after the fix.

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