Add Qt link uigetfile dialog implementation. * libgui/src/octave-qt-link.cc, libgui/src/octave-qt-link.h, (octave_qt_link::do_file_dialog): New function. (make_filter_list): New function. * libinterp/interpfcn/octave-link.cc (__octave_link_file_dialog__): New function. * libinterp/interpfcn/octave-link.h: (octave_link::file_dialog): New function. (octave_link::do_file_dialog): New virtual function. * scripts/plot/uigetfile.m: update to call octave_link file dialog if octave link is present. * libgui/src/dialog.cc, libgui/src/dialog.h (class FileDialog): New class. (QUIWidgetCreator::QUIWidgetCreator): added initialization of new var path_name. (QUIWidgetCreator::signal_filedialog): New function. (QUIWidgetCreator::create_filedialog): New function. (QUIWidgetCreator::filedialog_finished): New function. (QUIWidgetCreator::get_dialog_path): New function. * libgui/src/main-window.cc, libgui/src/main-window.h (main_window::connect_uiwidget_links): Added connect for handle_file_dialog. (main_window::handle_create_filedialog): New function.

--- a/libgui/src/main-window.h
+++ b/libgui/src/main-window.h
@@ -157,6 +157,11 @@
                                   const QFloatList&, const QFloatList&,
                                   const QStringList&);
 
+  void handle_create_filedialog (const QStringList &filters, 
+                                 const QString& title, const QString& filename, 
+                                 const QString &dirname,
+                                 bool multiselect);
+
   // find files dialog 
   void find_files(const QString &startdir=QDir::currentPath());
   void find_files_finished(int);