New BottomFeeder capabilities

I had someone complain about the fact that BottomFeeder always launched a new browser in Linux. I had no idea how to go about reusing an existing browser - but there were helpfule folks on the IRC channel, (thanks pete!) who lent a hand.

So now, in the latest dev build, you can launch a page from Bf and have it reuse an existing browser - so long as it's Netscape or Mozilla.