BUGFIX: Portable parsing of filename
BUGFIX: Portable parsing of filename

Used vtksys::SystemTools::GetFilenameName to
correctly extract the filename instead of the
previous implementation which was not entirely
portable.

Change-Id: Ifa5fa6ebb9b49c27fe84edc9a9fddca14273f86e

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