fix "send coins" via context menu in address book

- the send coins context menu entry was not working anymore, because
  a non current version of #2220 was merged onto current master
- also removes some unneeded spaces and adds a comment to
  WalletModel::getNumTransactions()

src/qt/bitcoingui.h

@@ -94,7 +94,7 @@ private:
     QAction *changePassphraseAction;
     QAction *aboutQtAction;
     QAction *openRPCConsoleAction;
-    
+
     QSystemTrayIcon *trayIcon;
     Notificator *notificator;
     TransactionView *transactionView;
@@ -162,7 +162,7 @@ private slots:
     /** Switch to receive coins page */
     void gotoReceiveCoinsPage();
     /** Switch to send coins page */
-    void gotoSendCoinsPage();
+    void gotoSendCoinsPage(QString addr = "");
 
     /** Show Sign/Verify Message dialog and switch to sign message tab */
     void gotoSignMessageTab(QString addr = "");