ENH: Remove unused variable & style enhancements
ENH: Remove unused variable & style enhancements

Removed no longer used variable lowResLevel and did a static
cast to an int when acquiring the number of levels s.t. we
don't have to cast later.

Change-Id: I8acdd1ea4d7fd407707c738ab2f3ccf2c27ca030

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