Switched from using diropenbox() to opendir().
This corresponds to one component of the patch_II file attached to https://gna.org/task/?6847 by Michael Bieri (https://gna.org/users/michaelbieri).
This will be a problem because in patch_II, opendir() is not defined in gui_bieri.relax_gui.
Authored by: bugman 2010-01-14
Parent: [r10214]
Child: [r10216]
