added VTK_EXECUTABLE and improved search for VTK_DATA_PATH
added VTK_EXECUTABLE and improved search for VTK_DATA_PATH

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