Added parallel connectivity filter
This new filter is a parallel version of vtkConnectivityFilter. It first computes the connectivity on each process, then ties together the different regions across process boundaries. * ScalarConnectivity mode is not supported. * Point and cell seeded connectivity is not supported. * The extraction modes VTK_EXTRACT_POINT_SEEDED_REGIONS, VTK_EXTRACT_CELL_SEEDED_REGIONS, and VTK_EXTRACT_SPECIFIED_REGIONS are not supported. Also added a test for vtkPConnectivityFilter that runs on 1 process and 4 processes.
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