PeerDiscovery:
+ performance improve, no using host name , but ip only
+ configuration preloaded with string "ip:port, ip:port, ip:port..."
 last merge fix
 last merge fix
Use long instead of hex for timestamp and difficulty
Update comment in conflict state
Fix recursive call bug for database
Sync only after adding a block
Use List for deletes in Track databases
Add logging for Program and VM
Fix some address logging in VM