Fix a few performance bugs in parallel stream tracing
Fix a few performance bugs in parallel stream tracing

- terminate trace if a new seed point fails all bounding box tests
- the # of "peeks" should start with 1

Change-Id: Ia65571f92f170c6fc31e91f503bfb6f55161f4e7

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