Graph Fixes and Improvements

[taviso]

• There seems to be some border on lower right part of pie charts, is that a bug or is it supposed to be a shadow?
• The hatching options don't work very well
• Footnotes work, but can be clobbered if the labels are too close
• Can I improve appearance with Unicode box drawing characters?
• The font options don't work, but we could make them work with figlet or unicode or something.