todo: cleanup of gnuplot input files.

doc/TODO.txt

@@ -4,6 +4,7 @@
 - Graphs: vertical x labels get cut off
 
 [Unsorted]
+- clean up after running gnuplot (option to keep .dat files around?)
 - show raw data in some way (the tables used currently aren't very nice)
 - allow multiple stylesheets
 	- parameter --style