No one can get access to buckets now without locking them. Also split up the trackerlogic.c-monster in functional sub-units. HEADS UP: this code is untested and not considered stable.

Clean all torrents now only cleans one bucket at a time
All torrents that are being worked upon in an announce are being cleaned on demoand
torrent's peer lists now keep extra counts for seeds and peers to speed up scrape and announce
Sync has gone for now. I will think up a new way to implement. The old one was way to slow.