An improved save interface

This started as addressing #1562, click a row to zoom to the change, but expanded to include icons, selectively listing relevant changes (less verticies), and more detailed information on each row about the geometry being edited.

Before and after:
![idchanges](https://f.cloud.github.com/assets/58878/1391299/ffd2fd32-3bfa-11e3-8bd3-5019272536b0.png)

@jfirebaugh Saman wasn't crazy about adding more colors to the interface by adding blue and orange to modified and warning icons, if you still want me to do it I can.