Perform: Labelling is now a function

  Node_View contains a function set-label(value, size, white)
  Use @active-view.set-label <label-text>, <font-size>, <white?>
  to call this where
    <label-text> is a string
    <font-size> is a font size (format \18pt or \40pt, eg)
    <white?> is a boolean as to whether the label should be white
Perform: Labelling now fixed where it was before.