The source project of this merge request has been removed.
Fix merge of vtkStructuredGrid with vtkAppendFilter
Remove WHOLE_EXTENT() key from vtkAppendFilter output information
Define RequestInformation in order to remove the key. If the key is present, StructuredGrid are not appended correctly since the UPDATE_EXTENT request will be based on an erroneous WHOLE_EXTENT key. Moreover the key is not needed since vtkAppendFilter output unstructured grid.