* glib/dbus-gvalue.c (struct _DBusGValue): Delete.
(dbus_g_value_types_init): Remove assertion.
(dbus_g_value_get_g_type, dbus_g_value_open)
(dbus_g_value_iterator_get_values, dbus_g_value_get_signature)
(dbus_g_value_copy, dbus_g_value_free): Delete unimplemented
functions related to DBusGValue. Now we marshal/demarshal
structures as GValueArray.
(dbus_gtype_from_signature_iter): Return G_TYPE_VALUE_ARRAY for
structures.
(signature_iter_to_g_type_array): Don't call
signature_iter_to_g_type_struct.
(signature_iter_to_g_type_struct): Delete.
(dbus_gvalue_to_signature): Delete.
(dbus_gvalue_to_signature): New function with same name as other
one; we can convert structures to signatures.
(demarshal_valuearray): New function.
(get_type_demarshaller): Use it.
(demarshal_recurse): Delete.
(marshal_proxy): New function.
(marshal_map): Warn if we can't determine signature from type.
(marshal_collection_ptrarray): Ditto.
(marshal_collection_array): Ditto.
(get_type_marshaller): Use marshal_valuearray.
(marshal_recurse): Delete.
(_dbus_gvalue_test): Add some tests.
* dbus/dbus-glib.h (struct _DBusGValueIterator):
(dbus_g_value_get_g_type, DBUS_TYPE_G_VALUE)
(dbus_g_value_open, dbus_g_value_iterator_get_value)
(dbus_g_value_iterator_get_values, dbus_g_value_iterator_recurse)
(dbus_g_value_free): Remove prototypes.
* glib/dbus-binding-tool-glib.c (dbus_g_type_get_lookup_function): Handle
G_TYPE_VALUE_ARRAY.
* glib/examples/example-service.c:
* glib/examples/example-client.c: Implement GetTuple.
* test/glib/test-dbus-glib.c:
* test/glib/test-service-glib.c:
* test/glib/test-service-glib.xml: Add structure tests.
