Replacing network-offline (old version 2xmonitor) with NM wlan 0% signal strength icon

[Siegfried Gevatter (RainCT)]

I'd suggest only showing the icon for the currently used connection
(even if you're connected using several methods at the same time NM
only uses one of them for the Internet, right?) and let placing the
mouse over the icon display a bubble with more detailed information
about all connections. Just an idea :).

-- 
Siegfried-Angel Gevatter Pujals (RainCT)
Ubuntu Developer. Debian Contributor.