allow to cancel exiting if editor tabs are modified and exit is requested in gui * file-editor-interface.h: new function check_closing * file-editor-tab.cc (ctor): set default for app_closing to 0 (not closing); (check_file_modified): dialog boxes for modified editor tabs depending on app closing or not; (conditional_close): no slot, but ordinary function returning close result; * file-editor-tab.h: conditional_close is function, not a slot; _app_closing is now int for closing from gui, from octave, not closing * file-editor.cc (dtor): calling new function check_closing if there are open tabs (exit requested octave), do not save session here since the tabs might already have been closed; (check_closing): new function saving session info and closing all tabs, stop closing tabs and returning false if user cancels exiting if there is a modified tab; (request_close_file, request_close_all_files, request_close_other_files, handle_tab_close_request): use conditional_close instead of signal; (construct): do not connect old signal for closing the tabs * file-editor.h: remove signal fetab_close_request, new function check_closing * main-window.cc (confirm_exit_octave): call file_editor::check_closing before really closing the app

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