Check if domainlist domains are covered by regex

[yubiuser]

If regex analysis is performed, compare exact domains on the black/whitelist against regex. Output does look like this:

  [i]  You hit a special case
       Your personal domainlist contains at least one domain that is also coverd by at least
       one of your regexs.


domain                              regex_id  regex                                                                                                                                                                                                                                            
----------------------------------  --------  -------------------------------------
log.expatgoneforeign.com            51        ^logs?\..*\..*$                                                                                                                                                                                                                                  
track.aliexpress.com                77        ^track(ing)?[0-9]*[_.-]                                                                                                                                                                                                                          
tracking-services.ao.com            77        ^track(ing)?[0-9]*[_.-]        

Might help to remove manually added domains which are also covered by regex.
Fixes issue #32

Additionally bump version to 2.6 and enforce up-to-date Pihole version (dnsmasq 2.87)