More actor table functionality

Add a couple of things that were missed when bringing in actor table view.

Enable scrolling for the actor table.

And the hover popups that display the actor path when just the actor name is displayed.

![hoverpopup](https://f.cloud.github.com/assets/59895/1489296/05c44e30-476d-11e3-8294-4f05546ef2c9.png)