Some minor cleanups of echocfg

1) Initialize saverobot.name since this is checked unconditionally.
   This has a side effect of initializing everything else, but name
   is the only thing that actually matters.
2) Add a bar to the global settings menu.
   Previously, if you scrolled near the bottom and selected an option,
   after changing the option, you would jump up to the last item on
   the initial screen.
3) Fix the AreaMgr Support default value to be the current, not the
   opposite of current.
4) Use the correct variable for EchoMail Relay Filtered Messages
   setting default.