APIEDIT BRANCH MERGE:

APIEDIT BRANCH MERGE:
* Splitting DB code from IPBlocklist::doSubmit() to IPBlocklist::doUnblock()
* Introducing IPBlocklist::UNBLOCK_* constants

Note to scrutinizers: because I made changes like $this->ip to $ip on many lines, the diff for this revision looks very complicated. Most of that is just diff(1)'s stupidity. Comparing the code by hand (eye?) may be less confusing.