Added patch from Marco Atzeri for QTerminal to build with cygwin. Removed some compiler warnings. * FileEditorTab: Parameter of setModified was not used properly. * OctaveLink: Exit status was not used, surrounded with Q_UNUSED. * MainWindow: Added prepareQuit slot to always save settings before quiting.

--- a/gui/src/MainWindow.h
+++ b/gui/src/MainWindow.h
@@ -90,6 +90,7 @@
   void processSettingsDialogRequest ();
   void showAboutOctave ();
   void updateTerminalFont ();
+  void prepareForQuit ();
 
 protected:
   void closeEvent (QCloseEvent * closeEvent);