Fixed #4799: Improved quickfix from 0943fecf039026b46e75cf18eda8ea5c3d290119
(Segmentation fault in K&R simplification inside lambda expression)
htdocs: mention comparison of cppcheck and pvs-studio (temporarily maybe)
htdocs/index.php: refactoring text
Fixed #4599 (False positive with fopen/fclose test)