fixed spelling error
added save-as dialog to XChart panel to save plots
added style manager
added Theme interface
title font
chart title visibility
chart legend style refactor
chart padding style refactor
chart axis ticks style refactor
more style abstraction work
plot gridline visibility, got rid of IHideable
moved all formatting code to a ValueFormatter class.
implemented  public Chart getChart(); in ChartPart
set most members  private and added getters
added line and scatter chart differentiation
cleaned up Series
cleaned up Chart
added manual axis min max override
fixed version
implemented ggplot2 theme