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.cpp

@@ -0,0 +1,14 @@
+#include "backupdialog.h"
+#include "ui_backupdialog.h"
+
+BackupDialog::BackupDialog(QWidget *parent) :
+	QDialog(parent),
+	ui(new Ui::BackupDialog)
+{
+	ui->setupUi(this);
+}
+
+BackupDialog::~BackupDialog()
+{
+	delete ui;
+}