Fix arg parsing

Print CNAME records

Rework the way NS are looked up

Sum lookup + query time to select the fastest server

Fix domain comparison bug

Do not print NS on last hop

Add best cold path computation and perform recursive queries NS

Fix handling of NOERROR empty answer

Refactor and new features

* Query all resolvers in parallel and report stats for each
* Report non glued NS lookup time
* Reformat output
* Refactor code

Check args length