BUG: Add some tolerance for roundoff errors.  I was seeing freezes depending on the compiler optimization options.
BUG: Add some tolerance for roundoff errors.  I was seeing freezes depending on the compiler optimization options.

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