BUGFIX: Use AMR index when loading data on demand
BUGFIX: Use AMR index when loading data on demand

Fixed issue wherein the native index may not be monotonically
increasing within each level which would create sparse arrays
of blocks within each level.

sumedhasingla/VTK,ashray/VTK-EVM,msmolens/VTK,cjh1/VTK,SimVascular/VTK,jmerkow/VTK,sankhesh/VTK,sankhesh/VTK,sumedhasingla/VTK,hendradarwin/VTK,candy7393/VTK,keithroe/vtkoptix,sumedhasingla/VTK,johnkit/vtk-dev,johnkit/vtk-dev,gram526/VTK,hendradarwin/VTK,aashish24/VTK-old,mspark93/VTK,biddisco/VTK,SimVascular/VTK,biddisco/VTK,ashray/VTK-EVM,sumedhasingla/VTK,demarle/VTK,biddisco/VTK,jmerkow/VTK,jmerkow/VTK,collects/VTK,johnkit/vtk-dev,mspark93/VTK,collects/VTK,demarle/VTK,candy7393/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,gram526/VTK,candy7393/VTK,gram526/VTK,sumedhasingla/VTK,jmerkow/VTK,aashish24/VTK-old,msmolens/VTK,johnkit/vtk-dev,keithroe/vtkoptix,demarle/VTK,aashish24/VTK-old,SimVascular/VTK,keithroe/vtkoptix,biddisco/VTK,sumedhasingla/VTK,biddisco/VTK,hendradarwin/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,sumedhasingla/VTK,jmerkow/VTK,aashish24/VTK-old,gram526/VTK,biddisco/VTK,collects/VTK,hendradarwin/VTK,demarle/VTK,sumedhasingla/VTK,ashray/VTK-EVM,SimVascular/VTK,collects/VTK,gram526/VTK,cjh1/VTK,gram526/VTK,demarle/VTK,collects/VTK,msmolens/VTK,candy7393/VTK,demarle/VTK,gram526/VTK,msmolens/VTK,demarle/VTK,sankhesh/VTK,ashray/VTK-EVM,johnkit/vtk-dev,sankhesh/VTK,msmolens/VTK,mspark93/VTK,keithroe/vtkoptix,jmerkow/VTK,candy7393/VTK,keithroe/vtkoptix,candy7393/VTK,mspark93/VTK,aashish24/VTK-old,msmolens/VTK,biddisco/VTK,keithroe/vtkoptix,sankhesh/VTK,jmerkow/VTK,ashray/VTK-EVM,gram526/VTK,cjh1/VTK,berendkleinhaneveld/VTK,cjh1/VTK,hendradarwin/VTK,SimVascular/VTK,berendkleinhaneveld/VTK,jmerkow/VTK,candy7393/VTK,johnkit/vtk-dev,cjh1/VTK,mspark93/VTK,sankhesh/VTK,cjh1/VTK,sankhesh/VTK,johnkit/vtk-dev,SimVascular/VTK,aashish24/VTK-old,hendradarwin/VTK,SimVascular/VTK,ashray/VTK-EVM,mspark93/VTK,mspark93/VTK,ashray/VTK-EVM,msmolens/VTK,mspark93/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,demarle/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,collects/VTK,msmolens/VTK,candy7393/VTK