R1:c5bb69fd7d79

Use a list view for DiffusionHistory

Summary: This moves Diffusion History to use an easier to parse list view for commits and their (diff, audit, build) status. I left TableView around, which is used on a repositories home, and we can maybe add a "graph view" history back as another controller. Not sure what the real use is for that kind of feature though. I don't have Harbormaster set up locally so I could use another install to give this a run. I also expect to maybe not live with this UI as final, I…