ENH: Added support for polyhedron cells to append filter.
ENH: Added support for polyhedron cells to append filter.

Original patch provided by Takuya Oshima.

sumedhasingla/VTK,gram526/VTK,johnkit/vtk-dev,msmolens/VTK,SimVascular/VTK,johnkit/vtk-dev,demarle/VTK,jeffbaumes/jeffbaumes-vtk,daviddoria/PointGraphsPhase1,spthaolt/VTK,SimVascular/VTK,keithroe/vtkoptix,demarle/VTK,cjh1/VTK,naucoin/VTKSlicerWidgets,hendradarwin/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,jmerkow/VTK,SimVascular/VTK,ashray/VTK-EVM,johnkit/vtk-dev,jeffbaumes/jeffbaumes-vtk,biddisco/VTK,spthaolt/VTK,sankhesh/VTK,daviddoria/PointGraphsPhase1,daviddoria/PointGraphsPhase1,gram526/VTK,demarle/VTK,jmerkow/VTK,hendradarwin/VTK,aashish24/VTK-old,arnaudgelas/VTK,msmolens/VTK,candy7393/VTK,biddisco/VTK,mspark93/VTK,collects/VTK,SimVascular/VTK,SimVascular/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,candy7393/VTK,hendradarwin/VTK,mspark93/VTK,demarle/VTK,gram526/VTK,biddisco/VTK,keithroe/vtkoptix,spthaolt/VTK,daviddoria/PointGraphsPhase1,sankhesh/VTK,jmerkow/VTK,biddisco/VTK,sankhesh/VTK,keithroe/vtkoptix,jeffbaumes/jeffbaumes-vtk,aashish24/VTK-old,spthaolt/VTK,ashray/VTK-EVM,berendkleinhaneveld/VTK,candy7393/VTK,cjh1/VTK,demarle/VTK,sumedhasingla/VTK,sankhesh/VTK,ashray/VTK-EVM,collects/VTK,collects/VTK,biddisco/VTK,naucoin/VTKSlicerWidgets,ashray/VTK-EVM,daviddoria/PointGraphsPhase1,jeffbaumes/jeffbaumes-vtk,SimVascular/VTK,sankhesh/VTK,ashray/VTK-EVM,cjh1/VTK,cjh1/VTK,msmolens/VTK,cjh1/VTK,arnaudgelas/VTK,naucoin/VTKSlicerWidgets,msmolens/VTK,gram526/VTK,johnkit/vtk-dev,keithroe/vtkoptix,ashray/VTK-EVM,naucoin/VTKSlicerWidgets,candy7393/VTK,SimVascular/VTK,msmolens/VTK,jmerkow/VTK,berendkleinhaneveld/VTK,aashish24/VTK-old,demarle/VTK,ashray/VTK-EVM,sumedhasingla/VTK,naucoin/VTKSlicerWidgets,jeffbaumes/jeffbaumes-vtk,candy7393/VTK,keithroe/vtkoptix,biddisco/VTK,hendradarwin/VTK,arnaudgelas/VTK,mspark93/VTK,naucoin/VTKSlicerWidgets,hendradarwin/VTK,jmerkow/VTK,sankhesh/VTK,gram526/VTK,johnkit/vtk-dev,aashish24/VTK-old,sankhesh/VTK,arnaudgelas/VTK,arnaudgelas/VTK,berendkleinhaneveld/VTK,hendradarwin/VTK,demarle/VTK,ashray/VTK-EVM,johnkit/vtk-dev,daviddoria/PointGraphsPhase1,mspark93/VTK,aashish24/VTK-old,candy7393/VTK,johnkit/vtk-dev,arnaudgelas/VTK,sumedhasingla/VTK,biddisco/VTK,jeffbaumes/jeffbaumes-vtk,demarle/VTK,sumedhasingla/VTK,collects/VTK,hendradarwin/VTK,collects/VTK,jmerkow/VTK,spthaolt/VTK,mspark93/VTK,gram526/VTK,candy7393/VTK,mspark93/VTK,sumedhasingla/VTK,aashish24/VTK-old,jmerkow/VTK,sumedhasingla/VTK,mspark93/VTK,candy7393/VTK,SimVascular/VTK,sumedhasingla/VTK,keithroe/vtkoptix,spthaolt/VTK,msmolens/VTK,jmerkow/VTK,cjh1/VTK,collects/VTK,keithroe/vtkoptix,spthaolt/VTK,msmolens/VTK,mspark93/VTK,gram526/VTK,gram526/VTK,berendkleinhaneveld/VTK,msmolens/VTK