Make it possible to disable Python output capture by VTK
vtkPythonInterpreter redirects Python output to vtkOutputWindow. Add an option to disable that so that VTK can be used in applications that have their own Python output redirection.
vtkPythonInterpreter redirects Python output to vtkOutputWindow. Add an option to disable that so that VTK can be used in applications that have their own Python output redirection.