minor cleanup
 * Transports: Use SigUtil.rectify() in DH
reduce log level
 * NTCP:
   - Add check for replayed session requests (ticket #1212)
   - Disable inbound check connection
   - Reduce object churn in EstablishmentManager
   - Don't pollute Hash cache in EstablishmentManager
   - addRateData() cleanup
 * Tunnels: Rate-limit connections at the OBEP (ticket #1134)
 * NetDB: Slow down router refresh after startup to reduce load
   on exploratory tunnels
finals, volatiles, cleanups
format tweak