minor optimization
Tunnel Endpoints:
   - Reject type 3 (undefined) delivery instructions at both OBEP and IBEP,
     would be treated as LOCAL
   - Reject type 0 (LOCAL) delivery instructions at OBEP, no current usage,
     would cause NPE if handled
JobQueue: Log a warning if a job is scheduled too far in the future,
          to catch bugs like the one in -7 where requeue() is called
          with an absolute time instead of a delay
log tweak
DeliveryInstructions:
  - Comment out unused encryption fields to save space
  - New static immutable LOCAL instruction to reduce object churn
Home page: replace all default eepsite icons.
   New icons from FatCow, licensed as specified in our docs.
   ref: http://zzz.i2p/topics/1492