Some fixes in python code

Samo Penic

2017-01-04 97264e53840b3544fef002d30cb80d6e9942139b

 python/trisurf/VTKRendering.py

@@ -18,7 +18,7 @@
      interactor = vtkRenderWindowInteractor()
      interactor.SetRenderWindow(self.renderer_window)
      interactor.Initialize()
       interactor.AddObserver("TimerEvent", self.RenderUpdate)
      interactor.AddObserver("TimerEvent", self.RenderUpdate)
      timerIDR = interactor.CreateRepeatingTimer(1000)
      self.filename=[]
      self.renderer=[]