moving db.js to be in lib root (it was confusing the background page generators in the extensions)
moving remote sync trackers out of _sync, instantiating in turtl.js. moving database setup function into turtl/database.js. removing a bunch of profile syncing junk that is no longer used, including a lot of associated events. this marks the apps conversion to use local db as the syncing point between client pieces vs events and POSTing to sync.

NOTE: some of these changes were duplicated already int he files branch! need to be merged in
merging in local branch (with some duplication/conflicts)