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/walletframe.h

@@ -25,7 +25,7 @@ public:
 
     bool addWallet(const QString& name, WalletModel *walletModel);
     bool setCurrentWallet(const QString& name);
-    
+
     void removeAllWallets();
 
     bool handleURI(const QString &uri);
@@ -47,7 +47,7 @@ public 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 = "");