Inside-aligned strokes in CG (matching GL)

Using CGContext clipping and stroke width doubling to draw an inside-aligned path for RingVisRep, InsideRingVisRep, and OutsideRingVisRep, per the tip at http://stackoverflow.com/questions/2488115/how-to-set-up-a-user-quartz2d-coordinate-system-with-scaling-that-avoids-fuzzy-d#answer-2488796 .
Fixed measured FPS not being accurate

It wasn't updating the mostRecentIndex (and thus always updating the same entry) because the SceneViewControllerRecentIntervalInfo was being passed to storeInterval:updatingRecentIntervalInfo: by value, instead of by pointer in order to be modified.  Oops.