Plot mcd (rather than offset) against mbsf in Growth Rate graph; Reduce point size to make points more distinguishable
Mess o' GUI changes: Make message dialogs top-level by setting parent to None; Use AboutDialog for both launch screen About button and Help > About Correlator... menu item; adjust layout of AboutDialog items; make buttons with all-caps names (e.g. CANCEL) stop shouting (e.g. Cancel); Shorten "meter" to "m" in a few labels; widen Export dialog so text/XML option isn't cut off