Saving last selected frame, as frame reference for anchor calculus
Fixing list files, removing .pgm from list. Progress bar to automatic anchoring was aproximated.TODO: fix use of the function. FIXME: default frame selected is frame 0, put it in red color. FIXME2: only one selectable reference frame, if selected other change its color
Fixed default selected frame, fixed one frame reference.TODO: fix use of the function.