More fixes, and convert python PS bindings to more glib style method names

sugar/chat/ActivityChat.py

@@ -10,7 +10,7 @@ class ActivityChat(GroupChat):
 		self._chat_service = None
 
 		self._activity = activity
-		self._pservice.connect('ServiceAppeared', self._service_appeared_cb)
+		self._pservice.connect('service-appeared', self._service_appeared_cb)
 
 		# Find an existing activity chat to latch onto
 		#activity_ps = self._pservice.getActivity(activity.get_id())

sugar/chat/Chat.py

@@ -233,7 +233,7 @@ class Chat(gtk.VBox):
 			return
 		if self._stream_writer:
 			self._stream_writer.write(self.serialize_message(svgdata))
-		owner = PresenceService.get_instance().get_owner()
+		owner = self._pservice.get_owner()
 		if owner:
 			self._insert_sketch(owner, svgdata)
 
@@ -245,12 +245,12 @@ class Chat(gtk.VBox):
 			self._stream_writer.write(self.serialize_message(text))
 		else:
 			print 'Cannot send message, there is no stream writer'
-		owner = PresenceService.get_instance().get_owner()
+		owner = self._pservice.get_owner()
 		if owner:
 			self._insert_rich_message(owner, text)
 
 	def serialize_message(self, message):
-		owner = PresenceService.get_instance().get_owner()
+		owner = self._pservice.get_owner()
 		return owner.get_nick_name() + '||' + message
 		
 	def deserialize_message(message):