Use RecipesBase instead of Plots

[dlfivefifty]

trafficstars

It's better to create a recipe than a function that calls plots directly for a number of reasons, one of which that you don't need to load Plots to use a package.

[RalphAS]

I agree in principle, but so far I have been unable to write recipes that plot line art on top of contour plots, whereas that is easy with top-level Plots methods.