Database window can now be opened from within the connection manager by

double clicking a connection or pressing enter when a connection is selected.

pglab/ConnectionManagerWindow.h

@@ -32,6 +32,8 @@ private slots:
 	void on_actionBackup_database_triggered();
 	void on_actionManage_server_triggered();
 
+	void on_listView_activated(const QModelIndex &index);
+
 private:
 	Ui::ConnectionManagerWindow *ui;
 	QDataWidgetMapper *m_mapper = nullptr;