- Move FetchAndAdd to static inner class
      - Remove duplicate classes from i2psnark.war (120KB);
        fixes sporadic FetchAndAdd IllegalAccessError
      - Fix standalone build to include i2psnark.jar since classes
        aren't in the .war anymore
      - Have standalone jetty use I2PAppContext temp directory
      - Replace launch-i2psnark.jar with launch-i2psnark script,
        since RunStandalone is in i2p.jar
      - Clean up jetty-i2psnark.xml, turn off jetty logging
      - Remove standalone build from the pkg target in the main build.xml

Eliminate all uses of the current working directory, and
set up multiple directories specified by absolute paths for various uses.

Add a WorkingDir class to create a user config directory and
migrate files to it for new installs.
The directory will be $HOME/.i2p on linux and %APPDIR%\I2P on Windows,
or as specified in the system property -Di2p.dir.config=/path/to/i2pdir
All files except for the base install and temp files will be
in the config directory by default.
Temp files will be in a i2p-xxxxx subdirectory of the system temp directory
specified by the system property java.io.tmpdir.

Convert all file opens in the code to be relative to a specific directory,
as specified in the context. Code and applications should never open
files relative to the current working directory (e.g. new File("foo")).
All files should be accessed in the appropriate context directory,
e.g. new File(_context.getAppDir(), "foo").

The router.config file location may be specified as a system property on the
java command line with -Drouter.configLocation=/path/to/router.config
All directories may be specified as properties in the router.config file.

The migration will copy all files from an existing installation,
except i2psnark/, with the system property -Di2p.dir.migrate=true.
Otherwise it will just set up a new directory with a minimal configuration.

The migration will also create a modified wrapper.config and (on linux only)
a modified i2prouter script, and place them in the config directory.

There are no changes to the installer or the default i2prouter, i2prouter.bat,
i2prouter, wrapper.config, runplain.sh, windows service installer/uninstaller,
etc. in this checkin.


    *  Directories. These are all set at instantiation and will not be changed by
    *  subsequent property changes.
    *  All properties, if set, should be absolute paths.
    *
    *  Name	Property 	Method		Files
    *  -----	-------- 	-----		-----
    *  Base	i2p.dir.base	getBaseDir()	lib/, webapps/, docs/, geoip/, licenses/, ...
    *  Temp	i2p.dir.temp	getTempDir()	Temporary files
    *  Config	i2p.dir.config	getConfigDir()	*.config, hosts.txt, addressbook/, ...
    *
    *  (the following all default to the same as Config)
    *
    *  Router	i2p.dir.router	getRouterDir()	netDb/, peerProfiles/, router.*, keyBackup/, ...
    *  Log	i2p.dir.log	getLogDir()	wrapper.log*, logs/
    *  PID	i2p.dir.pid	getPIDDir()	wrapper *.pid files, router.ping
    *  App	i2p.dir.app	getAppDir()	eepsite/, ...
    *
    *  Note that we can't control where the wrapper actually puts its files.

All these will be set appropriately in a Router Context.
In an I2P App Context, all except Temp will be the current working directory.

Lightly tested so far, needs much more testing.

    * More hopeful fixes for BOB.
    * Added new Robert ID to snark

      - Change file limit to 512 (was 256)
      - Change size limit to 10GB (was 5GB)
      - Change request size to 16KB (was 32KB)
      - Change pipeline to 5 (was 3)

      - Enable IPv6 stack in the JVM, hopefully won't break anything
      - Patch Jetty to support binding to IPv6 addresses
      - Allow multiple bind addresses for the router console
        in the clients.config file; for new installs the
        default is now "127.0.0.1,::1"
      - Change most instances of "localhost" to "127.0.0.1"
        throughout the code
    * Router:
      - Move some classes to private static inner

      so that apps can register more easily

      will not be rescheduled or cancelled, to reduce SimpleTimer
      lock contention

      - Fix double completion message
      - Add crstrack

      - Add default i2psnark.config for new installs
      - Remove wishlist link

    - Don't create SnarkManager instance until first call,
      so it doesn't create the i2psnark dir, read the config,
      etc., for single Snark instances.
    - Don't read i2psnark.config twice; fix setting
      i2psnark.dir
    - More Snark constructor changes for calling from router
    - Make max connections per torrent configurable

    - Use new I2PAppThread that does not call global listeners on OOM,
      so that OOMing apps will not shutdown the whole router.

    - Remove static instances of I2PSnarkUtil, ConnectionAcceptor,
      and PeerCoordinatorSet
    - Convert static classes in Snark to listeners
    - Fix Snark to work in single torrent mode again
    - Should now work with multiple single Snarks

  - Refactor to allow running a single Snark without a SnarkManager again,
    by moving some things from SnarkManager to I2PSnarkUtil,
    having Snark call completeListener callbacks,
    and having Storage call storageListener callbacks.
    This is in preparation for using Snark for router updates.
    Step 2 is to allow multiple I2PSnarkUtil instances.
  - Big rewrite of Storage to open file descriptors on demand, and
    close them when unused, so we can support large numbers of torrents.

   - Don't die if depend not available
   - Only verify Jetty hash once
   - Add streaming lib tests to depends task

      - Use the depend task with caching for more accurate dependencies
      - Make sure the routerconsole gets the latest router version
      - Fix addressbook repeated builds

This patch completes the javadoc fixups. Additions are pending.

    * i2psnark: Add codevoid link, remove mastertracker
    * hosts.txt: add echelon, codevoid

      - Add config i2psnark.linkPrefix to enable access to completed
        torrents from a different machine - examples:
           i2psnark.linkPrefix=file://///localserver/path/to/files/
           i2psnark.linkPrefix=http://localwebserver/path/
        Stop i2psnark, add to i2psnark.config, restart
      - Remove Galen and NickyB trackers

      (thanks devzero!)

      - Repair corrupted files with wrong length rather than die
      - Register shutdown hook to properly shutdown torrents when
        the router shuts down, hopefully will reduce corruption
      - Add Galen tracker
      - Add a note about how to chane directory

      - Fix NPE caused by race (thanks echelon!)
      - Add mastertracker, remove de-ebook