Improvements to VisualizationPanel.
* Changed from tiny ovals to just dotting the appropriate pixel.
* Renamed "HIGHLIGHT_COLOR" to the slightly more informative "ERROR_COLOR".
* Removed Math.round invocation in point2DToPoint giving us a floor instead of a proper round. This prevents the point from incorrectly ending up at zero, which is out of bounds for the buffer.
Changed FPS to 24, which gives some nicer feedback on how the error circle changes, and added a little JavaDoc to MCPiWindow.