Tag.toBase64() optimization
Javadoc fixes

Pass CloveSet to/from ECIESEngine

Improve DataMessage.toString()

I2CP: Don't require privkeys for meta in CLS2 message

minor efficiency improvements in parsing

Fix error sending large message
Fix NPE after handshake failure

Remove cast warnings
Fix RouterAddress.setExpiration() to match javadoc, used only by tests

- Data: Cache hostname lookups in RouterAddress
- Job Queue: Make search jobs droppable
- Router: Increase JVM DNS cache time
- Util: Add negative DNS lookup cache, increase cache size

it's undocumented, the other router implementations don't do it,
and unnecessary since we store addresses in a List, not a Set,
as of 0.8.14 2012-05