BottomFeeder UI stuff

I wasn't entirely happy with the real estate the button layout took in the latest BottomFeeder builds. So i rearranged the buttons to the top, and it got a lot better. However, the 'New' and 'Alerts' buttons really shouldn't always be enabled; they should only be enabled if there new or alert items available. That took a little bit of work in terms of state tracking, but it's done now. I think the end result is a cleaner UI. Now, if I get around to finishing the blogger API work, I could send out a general blog posting tool with BottomFeeder as a plugin....