conflictsolver: Isgd cutoff is 999 chars, not 1000
conflictsolver: Isgd randomly truncates for URLs longer than 1000 chars
conflictsolver: Do not throw exception when there is no hostname for tinyurl
tracker: Require tinyback v2.5 or newer
tracker: Remove special treatment for shortener klam (service_id 6)

Klam shut down so I can finally get rid of this ugly SQL query that did the
rate limiting.
Update tinyback submodule to v2.5