Separated whitelisting and redirections

I have split _Allow redirections and whitelisting_ into _Allow whitelisting_ and _Allow redirections_. 
_Allow whitelisting_ is enabled by default. _Allow redirections_ is disabled by default on new installations, on upgrade it defaults to value of _Allow redirections and whitelisting_.

Also a small bug is fixed - now tcpdump continues to log DNS queries when logfile is deleted (actually cleared).

It is possible that I will make other improvements soon. Would it be possible not to merge this pull request yet, but upload strings to translation system?