More control on Tomboy's Export to HTML Plugin

I changed up Tomboy's Export to HTML plugin today using the NoteHierarchy.cs I wrote a couple days ago. The two things I added were:

1. An export preview so you can fine-tune which notes are exported
2. The ability to create a table of contents at the top of the exported HTML page

This isn't checked-in to CVS or anything, but here's the patch file (should apply to latest CVS): http://blog.timothy.ws/tomboy-html-export-with-hierarchy.patch