This gives a lot more flexibility to the user to cover bandwidth, power,
and privacy issues related to network traffic. The current implementation
does not represent these prefs as well as it should. For example, it does
not force the traffic over the preferred network type if the other type is
set to "never". Instead it just tracks the "unmetered" status of the
active network, and acts based on that.
closes#1381
f8225f3122