initial branch

changes that make R chart and newdata partially work. Still issues with
coloring and finding variables.
Point sizing, Limits label panel width

Fixed width of limits label panel. Added user-defined size to points.
Improved default sizing for points and text. Cleaned up formatting for
statistics panel (still needs some more intelligence). Cleaned up
comments. Changes to sig.figs calculation (still not good).
Merge branch 'scoping_changes'