[ADDED] Migration to file-based StoreUUID.
[IMPROVED] Cleaner, more modular, migration code.
[FIXED] Don't hook activation to show password window: too annoying when focus shifts.
[FIXED] Don't set the active user when just importing ubiquity changes, it causes a log-out.
[ADDED] Mac: Ability to rebuild iCloud.
[REMOVED] Mac: wasRunning logic to avoid password window appearance on first activation.
[FIXED] Mac: Retrieve siteName from main thread.