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.

backupdialog.h

@@ -0,0 +1,22 @@
+#ifndef BACKUPDIALOG_H
+#define BACKUPDIALOG_H
+
+#include <QDialog>
+
+namespace Ui {
+class BackupDialog;
+}
+
+class BackupDialog : public QDialog
+{
+	Q_OBJECT
+
+public:
+	explicit BackupDialog(QWidget *parent = 0);
+	~BackupDialog();
+
+private:
+	Ui::BackupDialog *ui;
+};
+
+#endif // BACKUPDIALOG_H