More BottomFeeder work

I spent a large part of the day adding features to BottomFeeder. First off, Rich Demers made the new delete option to the html pane. I merged that in with the bug mail work I had been doing earlier. Then I added an option to persist items. If you mark an item as persistent, it won't be truncated (assuming you have that option set) off when you save your feeds. This is only in the dev stream so far, so bear in mind that it's work in progress...