Fix image mapper positions
Fix image mapper positions

When images had a position other than the origin, the offset was getting
applied twice. Causing the images to be in the incorrect position. Also
cleaned up some old unused function arguments while I was in there.

Change-Id: Ie88a5c711e2d578781e2a83f89e5cc584210361e

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