fix some oddities updating lexer and api-files for auto completion * file-editor-tab.cc (file_editor_tab): call notice_settings with flag that updating the lexer is not necessary since it is done while loading the file; (update_lexer): fix some binary operators; (new_file): call update_lexer since it is not called during initialization; (notice_settings): new flag for indicating initialization phase where update_lexer should not be called * file-editor-tab.h: notice_settings has an additional input parameter which is set to false by default * octave-txt-lexer.cc (lexer): new function returning the name of the lexer * octave-txt-lexer.h: new function returning the name of the lexer

gnulib-hg = gnulib-hg