Move all free functions in vtkDataArray into an anonymous namespace.
Move all free functions in vtkDataArray into an anonymous namespace.

Change-Id: I2c367230cbeada8bee88d66a844e3d52722d4506

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