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An implementation of the the Mandelbrot set exercise from the end of chapter two of O'Reilly's Programming Rust.

I have deviated from the original in two ways, one major, one minor.

First, I've made the rendering plane, which maps from the cartesian (pixel) plane to the complex plane, into a struct, and put all the major rendering features into an implementation on that struct. By adding a simple method, subplane(), I was able to make crossbeam rendering much simpler and easier to read by providing horizontal slices of the pixel plane, and I was also able to avoid recalculating the relationship between the two planes for every pixel. A small performance boost, but worthwhile.

Second, the output is PNM rather than PNG. I'm a huge PNM partisan, and you kids better get off my lawn.