Fix running multiple instances of Browse by adapting to API changes #2404

* sugar/presence/presenceservice.py: Specify the D-Bus interface when
  calling ActivityProperties.GetActivity
* sugar/activity/main.py: Set a default for the --invite option and
  make the create() D-Bus method accept a{sv} so we can pass the
  boolean value.

src/sugar/activity/main.py

@@ -56,7 +56,7 @@ class SingleProcess(dbus.service.Object):
         object_path = get_single_process_path(name_service)
         dbus.service.Object.__init__(self, bus_name, object_path)
 
-    @dbus.service.method("org.laptop.SingleProcess", in_signature="a{ss}")
+    @dbus.service.method("org.laptop.SingleProcess", in_signature="a{sv}")
     def create(self, handle_dict):
         handle = activityhandle.create_from_dict(handle_dict)
         create_activity_instance(self.constructor, handle)
@@ -76,7 +76,7 @@ def main():
                       action='store_true',
                       help='start all the instances in the same process')
     parser.add_option('-i', '--invited', dest='invited',
-                      action='store_true',
+                      action='store_true', default=False,
                       help='the activity is being launched for handling an '
                            'invite from the network')
     (options, args) = parser.parse_args()
@@ -146,7 +146,8 @@ def main():
             SingleProcess(service_name, activity_constructor)
         else:
             single_process = sessionbus.get_object(service_name, service_path)
-            single_process.create(activity_handle.get_dict())
+            single_process.create(activity_handle.get_dict(),
+                                  dbus_interface='org.laptop.SingleProcess')
 
             print 'Created %s in a single process.' % service_name
             sys.exit(0)