DEBUG: Added assert() to ensure slice topology
DEBUG: Added assert() to ensure slice topology

Added assert() after extracting slice to ensure
that the planar topology is correctly calculated.

msmolens/VTK,candy7393/VTK,sumedhasingla/VTK,SimVascular/VTK,ashray/VTK-EVM,cjh1/VTK,gram526/VTK,aashish24/VTK-old,ashray/VTK-EVM,jmerkow/VTK,mspark93/VTK,demarle/VTK,cjh1/VTK,sumedhasingla/VTK,hendradarwin/VTK,jmerkow/VTK,sankhesh/VTK,sankhesh/VTK,gram526/VTK,aashish24/VTK-old,gram526/VTK,collects/VTK,gram526/VTK,keithroe/vtkoptix,sankhesh/VTK,demarle/VTK,msmolens/VTK,sankhesh/VTK,jmerkow/VTK,jmerkow/VTK,berendkleinhaneveld/VTK,cjh1/VTK,demarle/VTK,mspark93/VTK,cjh1/VTK,collects/VTK,sumedhasingla/VTK,johnkit/vtk-dev,aashish24/VTK-old,msmolens/VTK,johnkit/vtk-dev,mspark93/VTK,keithroe/vtkoptix,ashray/VTK-EVM,collects/VTK,SimVascular/VTK,biddisco/VTK,hendradarwin/VTK,mspark93/VTK,demarle/VTK,demarle/VTK,candy7393/VTK,biddisco/VTK,candy7393/VTK,SimVascular/VTK,sumedhasingla/VTK,mspark93/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,msmolens/VTK,keithroe/vtkoptix,keithroe/vtkoptix,candy7393/VTK,msmolens/VTK,SimVascular/VTK,hendradarwin/VTK,sumedhasingla/VTK,keithroe/vtkoptix,ashray/VTK-EVM,candy7393/VTK,berendkleinhaneveld/VTK,hendradarwin/VTK,gram526/VTK,msmolens/VTK,cjh1/VTK,berendkleinhaneveld/VTK,jmerkow/VTK,sumedhasingla/VTK,johnkit/vtk-dev,biddisco/VTK,aashish24/VTK-old,demarle/VTK,jmerkow/VTK,ashray/VTK-EVM,johnkit/vtk-dev,aashish24/VTK-old,sankhesh/VTK,sankhesh/VTK,biddisco/VTK,keithroe/vtkoptix,ashray/VTK-EVM,sankhesh/VTK,gram526/VTK,msmolens/VTK,SimVascular/VTK,cjh1/VTK,ashray/VTK-EVM,hendradarwin/VTK,jmerkow/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,collects/VTK,ashray/VTK-EVM,sumedhasingla/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,sankhesh/VTK,keithroe/vtkoptix,johnkit/vtk-dev,gram526/VTK,aashish24/VTK-old,keithroe/vtkoptix,candy7393/VTK,SimVascular/VTK,mspark93/VTK,biddisco/VTK,collects/VTK,demarle/VTK,candy7393/VTK,demarle/VTK,johnkit/vtk-dev,biddisco/VTK,jmerkow/VTK,johnkit/vtk-dev,gram526/VTK,berendkleinhaneveld/VTK,biddisco/VTK,mspark93/VTK,collects/VTK,mspark93/VTK,msmolens/VTK,hendradarwin/VTK,candy7393/VTK,hendradarwin/VTK