tunnels from being expired and causing high CPU usage

    years ago.

    efficiency and to remove global lock. Also remove separate
    time List for space savings.

With 0.8.9 we'll be switching to Maxmind's geoip services and they include more
countries than our old source.

     and '57a19829917d3dc2ad19e95c7b3bafd3673c3903'

    persistent key after tunnel creation (ticket #480)

    to avoid clogging the Hash cache with one-time hashes,
    and avoiding the global cache lock.
    This also greatly increases Hash cache hit rates.
    Also use SimpleByteCache for temporary byte buffers.

     and 'fb1eccf1532a765266448fe4a13c6f833539a37b'

     and 'd49c39f3e1dd314595a8608df8761f77520c6550'

     and '929973e4fe14793240e998315d396a19461655ee'

This isn't the cause of the ISJ deadlocks though.

The developers don't hang out in #i2p. They're in #i2p-dev.

    - Hopefully fix race NPE, thx dream
    - Catch some more fragment errors
    - Exception and log tweaks
    - Cleanups and javadocs

    (fixed on 12/29/10, accidentally reverted in 12/30/10 propagate)