graphics

[Jason Stover]

I was thinking about how to make good graphics, which should
probably be a high priority after the release. I started
reading 

"The Grammar of Graphics," 2nd edition by L. Wilkinson, Springer 2005.
ISBN 0-387-24544-8.

It's good so far, and says a lot about how I think we should
approach making a graphics engine in PSPP. The author shows
a way of looking at an "algebra" for making graphics from data.
Using those ideas would let us program not just graphics, but
also consistent framework under which to make those graphics. 
I think it's a direction we should look at.

-Jason