Add interserver compatability for dial and visualizer

[Thorinwasher]

Probably low priority, but I might as well add it:

Maybe have a flag, for example -i before you type the networkname to switch it into interserver mode. Something like this:

sgc dial -i inteserverNetworkName portalName
and
sgc visualize -i inteserverNetworkName

I don't know how much more complicated this would make the name parsing, but I don't currently have any other ideas except maybe:

sgc interserverdial inteserverNetworkName portalName

(you got the gesture)