Proxy fixes

I managed to find an hour or two in between various things. I've taken a look at the proxy code, and added some fixes in "master". To be polite, I didn't quite understand the previous code. So... I've deleted things, and simplified other things. The result is that the "zombie" home server detection should be better. I don't know if it fixes the "crash on dead home server" issue that people were seeing. I wasn't able to reproduce that. But, the relevant code is now different. So I hope it's fixed. As always, blame Arran for any bugs. :) Alan DeKok.