update copyright notices in libgui directory * documentation-dockwidget.cc, documentation-dockwidget.h, files-dockwidget.cc, files-dockwidget.h, history-dockwidget.cc, history-dockwidget.h, m-editor/file-editor-interface.h, m-editor/file-editor-tab.cc, m-editor/file-editor-tab.h, m-editor/file-editor.cc, m-editor/file-editor.h, m-editor/lexer-octave-gui.cc, m-editor/lexer-octave-gui.h, main-window.cc, main-window.h, octave-adapter/octave-event-listener.h, octave-adapter/octave-event-observer.h, octave-adapter/octave-event.cc, octave-adapter/octave-event.h, octave-adapter/octave-link.cc, octave-adapter/octave-link.h, octave-adapter/octave-main-thread.cc, octave-adapter/octave-main-thread.h, octave-gui.cc, octave-qt-event-listener.cc, octave-qt-event-listener.h, resource-manager.cc, resource-manager.h, settings-dialog.cc, settings-dialog.h, symbol-information.cc, symbol-information.h, terminal-dockwidget.cc, terminal-dockwidget.h, welcome-wizard.cc, welcome-wizard.h, workspace-model.cc, workspace-model.h, workspace-view.cc, workspace-view.h: Use copyright notice format that is consistent with other files in Octave.

#include <octave/oct.h>
#include <octave/ov-struct.h>

DEFUN_DLD (structdemo, args, , "Struct demo.")
{
  int nargin = args.length ();
  octave_value retval;

  if (args.length () == 2)
    {
      octave_scalar_map arg0 = args(0).scalar_map_value ();

      if (! error_state)
        {
          std::string arg1 = args(1).string_value ();

          if (! error_state)
            {
              octave_value tmp = arg0.contents (arg1);

              if (tmp.is_defined ())
                {
                  octave_scalar_map st;

                  st.assign ("selected", tmp);

                  retval = octave_value (st);
                }
              else
                error ("sruct does not contain field named '%s'\n",
                       arg1.c_str ());
            }
          else
            error ("expecting character string as second argument");
        }
      else
        error ("expecting struct as first argument");
    }
  else
    print_usage ();

  return retval;
}