Also added "Save copy as"

This prompts for a new filename but it keeps remembering the previous name.

mainwindow.h

@@ -77,6 +77,7 @@ private:
 	bool continueWithoutSaving();
 	void closeEvent(QCloseEvent *event);
 	void showEvent(QShowEvent *event);
+	QString promptUserForSaveSqlFilename();
 	void saveSqlTo(const QString &filename);
 private slots:
 
@@ -102,6 +103,7 @@ private slots:
 	void on_actionExplain_Analyze_triggered();
 	void on_actionCancel_triggered();
 	void on_actionSave_SQL_as_triggered();
+	void on_actionSave_copy_of_SQL_as_triggered();
 };
 
 #endif // MAINWINDOW_H