Mention popup fix

+ will now only popup with a mention alert when you are not on the same
tab/window.
+ will also no longer popup by mentioning yourself

cockatrice/src/tab_room.h

@@ -57,6 +57,7 @@ private slots:
     void actOpenChatSettings();
     void addMentionTag(QString mentionTag);
     void focusTab();
+    void actShowMentionPopup(QString &sender);
     
     void processListGamesEvent(const Event_ListGames &event);
     void processJoinRoomEvent(const Event_JoinRoom &event);