fill usermessage lookupkey

pb/messages.proto

@@ -85,8 +85,8 @@ message PackedUserMessage {
 
 // structure defining information that might be exchanged between two peers.
 message UserMessage {
-	string destination = 1; 
-	string from = 2; 
+	string destination = 1; // Lookupkey
+	string from = 2; // My public key for that contact
 	string type = 3; 
 	bytes data = 4; 
     message ConversationStatus {