VShell: parse Path args leniently by snipping any trailing slashes
VShell: parse Path args leniently by snipping any trailing slashes

(It is slightly annoying with strict path parsing that disallows trailing slash
when using VShell.)

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