Profiles:
- Fix first heard about to be earliest, undeprecate
- Fixup first heard about at profile readin
- Persist good/bad lookup/store DBHistory stats added in 0.7.8
- Remove unused DBHistory methods and fields to save memory
- Change bonus longs to ints to save memory
- Extend profile expiration time from 3 days to 15
- Consolidate getLong()
- Synch fixes
Sybil tool: Tweaks and enhancements