I2PTunnel: Don't send 'X-Forwarded-For' on HTTP server tunnels for anonymity reasons (reported by 'trixie' on IRC).

          (thx str4d)

not restarting correctly, caused by previous checkin

  a client socket manager configured with i2cp.newDestOnResume,
  or a shared client.
  This prevents lots of orphaned StreamingTimer threads.
  There are still cases where these threads may stick around,
  when a tunnel is stopped but not restarted. We don't know in
  some cases when a tunnel could be restarted and when it can't.
  destroySocketManager() should always be called when discarding a
  SocketManager but i2ptunnel doesn't do that now. More to do,
  but this fixes the most common case of leaked threads.
  Related tickets: ##642 #961

-28

 - volatile -> atomic
 - unused code and fields
 - closing streams
 - hashCode / equals
 - known non-null
 - Number.valueOf
 - new String
 Still avoiding SAM, BOB, SusiMail

  Eepsite fix for new installs only.
  Fix i2psnark BasicServlet javadoc about param prefix.
  (ticket #1128)

  - Fix several 'increment of volatile is not atomic' all over
    Remaining: UDP PeerState.java, to be checked in separately
  - Comment out all of unused MessageStateMonitor

Findbugs: More findbugs fixes. Including but not limited to: null check fixes and some synchronization

  - Fix uncaught exception when log level = WARN, broken in -23

   New icon from FatCow, licensed as specified in our docs.
   ref: http://zzz.i2p/topics/1492