Plots a color contour of flux-surface averaged D,χ in (r,t) plane. Useful for getting a fuller sense of how "steady-state" a run is (especially with profile effects on).
Note: becasue of an IDL bug, the colorbar on the right of the plot is disabled by default. This bug does not appear to be a problem when running IDL in OS X, so the colorbar can be easily resotred by "uncommenting" the relevant code.