machine: Remove a redundant call

This call should have been deleted as part of commit
33883def2a47fb477d2f0fb4928c8777466f643b (Fix positioning of thumbnail
in properties view).

https://bugzilla.gnome.org/show_bug.cgi?id=706414
topbar: Gd.MainToolbar -> Gtk.HeaderBar

Lets try to reduce oure dependency on Gd as much as possible.

This also gets rid of the workaround for libgd bug#698289.

https://bugzilla.gnome.org/show_bug.cgi?id=706414
properties: Gd.MainToolbar -> Gtk.HeaderBar

https://bugzilla.gnome.org/show_bug.cgi?id=706414
wizard: Gd.MainToolbar -> Gtk.HeaderBar

https://bugzilla.gnome.org/show_bug.cgi?id=706414
display-page: Gd.MainToolbar -> Gtk.HeaderBar

Two reqression from this one:

* Dragging of titlebar to unfulscreen doesn't work even though i do:

-        add_events (Gdk.EventMask.POINTER_MOTION_MASK);
+        add_events (Gdk.EventMask.POINTER_MOTION_MASK |
+                    Gdk.EventMask.BUTTON_PRESS_MASK |
+                    Gdk.EventMask.BUTTON_RELEASE_MASK);
+

The header bar just won't receive any events. :( I also noticed that
this has been only working for OSD toolbar we show when server-side mouse
is available but not for the non-OSD toolbar. Keeping this fact in mind
and that there still is the unfullscreen button in an obvious place, I
don't think this is a very major regression. Having said that, I'll
hopefully fix it soon.

* The restore button in OSD toolbar looks chopped on the left side.
  Should be a matter of tuning the theme.

https://bugzilla.gnome.org/show_bug.cgi?id=706414
configure: Stop building Gd.MainToolbar

We don't use it anymore.

https://bugzilla.gnome.org/show_bug.cgi?id=706414
Switch to client-side decoration

In preparation for the wayland tech demo in 3.10, all other GNOME 3 apps
are switching to client-side window decoration so we should too.

https://bugzilla.gnome.org/show_bug.cgi?id=706414
app: Switch to fullscreen after connection is complete

Without this change, there is no toolbar visible while connecting to a
box after the OCD change.

https://bugzilla.gnome.org/show_bug.cgi?id=706414