Removed partitioning of z-buffer; made Clear only clear the color buffer if the renderer is not transparent.
Removed partitioning of z-buffer; made Clear only clear the color buffer
if the renderer is not transparent.

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