Some intermediate work for release country browsing:
- add new hierarchical country table
- convert all release records to reference new country table
- use an inline tree widget for release info country picker. I don't think this will be popular; I'll switch it back if no one likes it
- fix bug with the inline tree auto-scrolling (you could leave it in an imperfectly scrolled state by zipping the mouse quickly down the list and over the back button)
- fix display corruption when clicking on menu items in inline tree widget (reported by Engledogg)
