This has to be done in the future:

The selection stuff has to be reviewed. Sometimes parts of selection boxes
remain on the screen when the next box is started

Automatic creation of marshal definitions and functions via glib-genmarshal

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)
  function to freeze rulers (remove the signal connect) 
  

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