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

Enable tunnel testing when without addresses (ticket #1835)
Use fast peers for inbound tunnels when without addresses (ticket #1835)

Change from 60s DHS to 60m DBF
Use reply key as filter key, not first part of
encrypted data, to match the specs and hopefully reduce dups
BuildMessageProcessor cleanups
log and stat tweaks
remove deprecated methods
remove some timing measurements
javadocs

eliminate caching previously enabled for routers with high memory limits
Log tweak on sig verify fail
DataHelper.writeLong() to write(byte) conversion
DatabaseEntry: Remove deprecated, unused setRoutingKey()

(which is useless) on signature verification fail,
in an attempt to find the culprit

  - Change addCapabilities() to getCapabilities()
  - Add netdb family sign/verify utility (ticket #1510)
    (verify not yet used)
RouterInfo:
  - Remove addCapability() and delCapability()
StatPublisher:
  - Remove Service interface, not required
  - Consolidate getCapabilities() and network ID here
  - Add family signatures
  - Remove unused coreVersion and stat_uptime (as of 0.9.24)

omits SAM, BOB, reflection, commented-out code, and a few other places

NetDb: Drop all-zero lookups and stores, add stats
SSU:
 - Fix debug logging of dumped packets
 - Drop sessions with bad clock skew, banlist peer, add stats
 - Drop sessions with corrupt DSM, banlist peer, add stats
Log tweaks

- FloodfillMonitorJob:
  - Use avg of router.tunnelBacklog instead of current backlog
- Some language/spelling fixes