Spruced up the inline tree widget (as seen in the "forms" section of the update part page):
- fixed missing arrows
- styled menu panes to look like the ones in the breadcrumb widget
- hooked up auto-scrolling (and got rid of scrollbars)
- removed level of div nesting (for better performance)
- removed convoluted choicePath stuff, and replaced with a simple algorithm for generating tree path from leaf node
