improve address book, add less conspicious toolbar icon

addresstablemodel.h

@@ -9,6 +9,20 @@ class AddressTableModel : public QAbstractTableModel
 public:
     explicit AddressTableModel(QObject *parent = 0);
 
+    enum {
+        Label = 0,  /* User specified label */
+        Address = 1,  /* Bitcoin address */
+        Type = 2 /* Send/Receive, used for filter */
+    } ColumnIndex;
+
+    static const QString Send; /* Send addres */
+    static const QString Receive; /* Receive address */
+
+    int rowCount(const QModelIndex &parent) const;
+    int columnCount(const QModelIndex &parent) const;
+    QVariant data(const QModelIndex &index, int role) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
+    Qt::ItemFlags flags(const QModelIndex &index) const;
 signals:
 
 public slots: