explicitly close figures in clean_up_and_exit instead of using an atexit function * graphics.cc (Fdrawnow): Don't register __go_close_all__ as an atexit function. * __go_close_all__.m: Delete. * plot/module.mk (plot_FCN_FILES): Remove __go_close_all__.m from the list. * graphics.cc (gh_manager::create_instance): Do register cleanup function. * graphics.cc (delete_graphics_objects, delete_graphics_object, close_figure, force_close_figure): New functions. (F__go_delete__): Call delete_graphics_objects to do the work. * graphics.h, graphics.cc (gh_manager::close_all_figures, gh_manager::do_close_all_figures): New functions. * graphics.h.in, graphics.cc (close_all_figures): New function. * toplev.cc (clean_up_and_exit): Call close_all_figures. * graphics.h.in (uitoggletool::~uitoggletool, uipushtool::~uipushtool, uitoolbar::~uitoolbar, uipanel::~uipanel, uicontrol::~uicontrol, uicontextmenu::~uicontextmenu, uimenu::~uimenu, hggroup::~hggroup, surface::~surface, image::~image, text::~text, line::~line, axes::~axes, figure::~figure, root_figure::~root_figure): Don't delete children. * toplev.cc (SAFE_CALL, IGNORE_INTERRUPT): Rename to OCTAVE_SAFE_CALL and OCTAVE_IGNORE_INTERRUPT and move to toplev.h. Temporarily set Vdebug_on_error and Vdebug_on_warning. Reset error_state to zero. Change all callers. * graphics.h.in (base_graphics_toolkit::close): New virtual function. (graphics_toolkit::close, graphics_toolkit::close_all_toolkits): New functions. * graphics.cc (gnuplot_toolkit::close): New function. ): * __init_fltk__.cc (F__init_fltk__): Don't register __remove_fltk__ as an atexit function. (F__remove_fltk__): Move to fltk_toolkit::close.