use generic dialog for cd or addpath question * dialog.h, dialog.cc (cd_or_addpath_dialog): Delete class. (QUIWidgetCreator::get_dialog_button): Return QString, not QString*. Change all uses. (QUIWidgetCreator::signal_debug_cd_or_addpath): Delete. (QUIWidgetCreator::create_debug_cd_or_addpath_dialog): Delete. * file-editor-tab.cc (file_editor_tab::file_in_path): Also use same_file to compare curr_dir and info.path. * main-window.h, main-window.cc (main_window::handle_create_debug_cd_or_addpath_dialog): Delete. (main_window::connect_uiwidget_links): Delete connection from uiwidget_creator::create_debug_cd_or_addpath_dialog to main_window::handle_create_debug_cd_or_addpath_dialog. * octave-qt-link.cc (octave_qt_link::do_debug_cd_or_addpath_error): Use generic dialog for cd or addpath question.