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Added simpler Gather(vtkDataObject*) method.

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:cleanup_gather_dataobjects into master

vtkCommunicator::GatherV() required the destination process to know what data types to expect. This was unnecessary. There's enough information in the marshalled data object received from the sender side to deduce that. Adding new vtkCommunicator::Gather() and vtkMultiProcessController::Gather() methods that provide a simpler interface.

Updating GenericCommunicator test to test for the new API.

Needed for paraview/paraview#16779 (closed)

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