Added data and gnuplot command files for figures 1,2,4,and 5.

Currently, these files are exactly what the source code produces. I plan to edit them by hand to create the publication-worthy versions (and then probably update the source to load those files instead of building them).
Updated Figs 1,2,4,and 5 to use epslatex terminal
Updated figure command files to use LaTeX math code for some labels / text areas
Made figures black and white, removed key box, change key location, ...