** Update: Bug Fix **
1) When awstats/webalizer are selected, older index.html of webalizer or index.php of awstats must be deleted in order to avoid conflict between them.
So, when you select awstats, index.html is deleted (apache2_plugin.inc.php). If webalizer, index.php is deleted every time cron_daily.php is executed (cron_daily.php).
2) index.php.awstats was modified to fix january month bug...
Main post has been updated. Till, do you need modified the task in roadmap too?