Fixed Slice representation in client-server modes.
vtkPVDataDeliveryManager was ending up not requesting new data when slice parameters were changed. This happened because the mtime we used in vtkPVDataDeliveryManager used the data-time, which clearly didn't change on the client after every update. Since vtkPVDataDeliveryManager::SetPiece() uses the executive's data-time to check if data was really updated, we shouldn't use the data mtime in vtkPVDataDeliveryManager's SetDataObject() call.
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