Introduced the MasterController as part of working on loading catalogue information.

Need a central piece to manage the catalogue data per database to prevent loading
this multiple times. MasterController is now also used to enable reopening the
connection manager from a query window after the connection manager has been closed.

mainwindow.h

@@ -27,14 +27,14 @@ namespace Pgsql {
 }
 
 class QueryTab;
-
+class MasterController;
 class QCloseEvent;
 
 class MainWindow : public QMainWindow
 {
 	Q_OBJECT
 public:
-	explicit MainWindow(QWidget *parent = 0);
+	explicit MainWindow(MasterController *master, QWidget *parent);
 	~MainWindow();
 
 	void setConfig(const ConnectionConfig &config);
@@ -51,6 +51,8 @@ private:
 	TSQueue m_taskQueue;
 	ConnectionConfig m_config;
 
+	MasterController *m_masterController;
+
 
 	QueryTab *GetActiveQueryTab();
 
@@ -75,6 +77,7 @@ private slots:
 	void on_actionNew_SQL_triggered();
 	void on_tabWidget_tabCloseRequested(int index);
 	void on_actionExplain_triggered();
+	void on_actionShow_connection_manager_triggered();
 };
 
 #endif // MAINWINDOW_H