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/parse.h>

DEFUN_DLD (funcdemo, args, nargout, "Function Demo")
{
  int nargin = args.length ();
  octave_value_list retval;

  if (nargin < 2)
    print_usage ();
  else
    {
      octave_value_list newargs;
      for (octave_idx_type i = nargin - 1; i > 0; i--)
        newargs (i - 1) = args(i);
      if (args(0).is_function_handle ()
          || args(0).is_inline_function ())
        {
          octave_function *fcn = args(0).function_value ();
          if (! error_state)
            retval = feval (fcn, newargs, nargout);
        }
      else if (args(0).is_string ())
        {
          std::string fcn = args (0).string_value ();
          if (! error_state)
            retval = feval (fcn, newargs, nargout);
        }
      else
        error ("funcdemo: expected string,",
               " inline or function handle");
    }
  return retval;
}