This has to be done in the future:

Suggestions by Dave:
  Export the plot data as a struct for filter functions (i.e. ps, xfig, or
  whatever)

Suggestions by Ionutz:
  Functions:
  void gtk_databox_enable_normalized(GtkDatabox *box);
  void gtk_databox_disable_nomalized(GtkDatabox *box);
  (reduce values to -1<x<1)
  destroy bars and rulers instead of hiding (keep the adjustments!!!)
  function to freeze rulers (remove the signal connect) 
  

-- User defined points, dots, polygons, whatsoever...

