The connection editor window is shown before all of its pages are
initialized, causing it to jump when it gets its final size. Avoid
that by not showing it before it is ready.
https://bugzilla.gnome.org/show_bug.cgi?id=693781
This code is fairly independent of the rest, and we don't want
net-device-wifi.c to become too massive and unmaintainable.
The code in connection-editor/ is fairly similar to
nm-connection-editor, with some simplification because we
currently only edit wireless connections.
The code in wireless-security/ is almost a straight copy
of the same code in nm-connection-editor, with some changes
to the .ui files to make them fit better in the new design.
