Allow constructing a GDBusProxy for well-known names as discussed here
http://mail.gnome.org/archives/gtk-devel-list/2009-October/msg00075.html
including test cases.

Make it possible to create a GDBusProxy for a GBusType instead of a
GDBusConnection. This requires G_BUS_TYPE_NONE so add that too.

Nuke g_bus_watch_proxy() since one can now more or less use GDBusProxy
for this.

Port gdbus-example-watch-proxy to this new API and include this
example in the GDBusProxy doc page.

Also nuke the GType parameter from the GDBusProxy constructors as
requested here: https://bugzilla.gnome.org/show_bug.cgi?id=621229

Also update the porting guide and other API docs for this change.

Also fix a bug in the signal dispatching code so each subscriber only
get notified once, not N times, for the same signal. Also add a test
case for this.

https://bugzilla.gnome.org/show_bug.cgi?id=621213Signed-off-by: David Zeuthen <davidz@redhat.com>

Use "&s" instead of "s", and free the variant iters after use.

Bug #618663.

After a long discussion, this has finally been standardized in the
D-Bus spec. See

 http://lists.freedesktop.org/archives/dbus/2010-May/012667.html
 http://lists.freedesktop.org/archives/dbus/2010-May/012712.htmlSigned-off-by: David Zeuthen <davidz@redhat.com>

This makes it possible to use the cached properties mechanism even if
constructing the proxy with the DO_NOT_LOAD_PROPERTIES flag.

This is useful for cases where you obtain the and track object
properties out-of-band. For example, in udisks, the plan is to have
something like this

 Manager.GetObjects    (out ao paths, out aa{sa{sv}} all_properties);
 Manager.ObjectAdded   (o path, a{sa{sv}} all_properties);
 Manager.ObjectChanged (o path, a{sa{sv}} all_properties);
 Manager.ObjectRemoved (o path, a{sa{sv}} all_properties);

E.g. the first GetObjects() call will return *all* data about *all*
exported objects. Further, this way a client will only need to listen
these three signals (three AddMatch) on the Manager object and it will
never need to do GetAll() etc (e.g. can use DO_NOT_LOAD_PROPERTIES).

(Of course this only works if the client is interested in all
objects... while this is true for udisks it is generally not true for
other D-Bus services).

Also use expected_interface to check for programming errors.