Peno Curve layout for raster graphs

[josiahseaman]

The code for the extra curvey peano layout was already written for Desktop Skittle. The main advantage of this layout is that it clumps up adjacent things right next to each other rather than stretching them out over a line. I didn't notice any huge revelations this opens up. The other downside is that it invalidates the veritcal line synchronization with non-raster graphs.