(ticket #542, see also http://zzz.i2p/topics/996)

    same-country peers; deduct for recently-unreachable peers

    - Increase default max connections again
    - Reduce min idle time
    - Separate out introducer pinger from introducer selection
      so it can be run separately and more often
    - Only ping introducers if we need them

    - Make most classes package private
    - Final, static, logs, cleanups
    - Consolideate createRateStat calls
    - Add getTotalLength()
    - Remove unused lengthOverride()

    - Refactor for concurrent, at some small risk of false negatives
    - Optimizations to cache objects and reuse offsets

     and 'cba0dcc238e5631aff5850f49d9cb07ec70e8f65'

  * Tunnels: Connection limit mitigation:
    - Disable tunnel testing
    - Implement closest-to-the-key tunnel selection
    - Use closest-selection in NetDB lookups, stores, and verifies;
      OCMOSJ; and in BuildRequestor

    fix udp.establishRejected stat

    the stat manager last to reduce chance of NPEs
    (similar to that in tickets #534,535)

countries.txt. zzz: thanks for reminding me that most users will have an old
geoip file.

  * FloodfillMonitorJob: Log tweak (ticket #533)
  * I2CP: Improve error message (ticket #533)
  * JobQueue:
    - Log error when queue is out of order
    - Log tweaks
  * FloodfillPeerSelector: Fix stat NPE (tickets #534,535)
  * RouterThrottle:
    - Fix stat NPE (tickets #534,535)
    - Increase max tunnels and max delay again
  * OutNetMessagePool: Log tweak (ticket #533)
  * Router:
    - Add OOM help (ticket #533)
    - Prevent parallel shutdowns after multiple OOMs (tickets #534,535)

    - Add gunzip support (nonproxied only)
    - Clean up progress formatting
  * SSLEepGet:
    - Add gunzip support
    - Increase buffer size