Adds a function that compares wireless networks and keeps them sorted
at all times. Order is: first already configured connections, then
first secure networks, then alphabtic. Also, the appearance of a new access
point no longer causes the whole menu to be rebuilt (but it still linear
searches for the position, I guess that could be skipped), which caused
the addition of more code for tracking the active access point.
https://bugzilla.gnome.org/show_bug.cgi?id=646580
d0780d1622