Fixed nanovis to take a series of server names as a comma-separated
list, and to try them one after another to make a connection. That
way, if one server is down, you can still reach the rest of the farm.
Added a customized bug handler that looks a little less frightening
than the standard Tcl dialog. Someday, this should log all errors
to a web service, but for now, it just encourages the user to do so.
