Add commons-io dependency to make file upload work in browse dialog.
Add commons-io dependency to make file upload work in browse dialog.

(Already works OK in vortex, since commons-io happens to be transitively
included.)

vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk