router tests

Defaults to the ant library path (the previously hardcoded path) if not set.

  - trimMtnRev: create a new property with the revision trimmed to  8 characters.
  - getExtendedVersion: create a new property that includes the full version with the shortened MTN revision tacked on
  - debchange:  automatically update debian/changelog with the I2P version. Called by the "debian" target unless the property noAutoDebchange is set.
  - debian-tarball: export i2p.i2p branch to a new directory, remove the binaries like jbigi and launch4j, and create a tarball.
* move packages created by "ant debian" to ${basedir}
* add debian/changelog to .mtn-ignore since it is now automatically updated (by default).
* add *.deb to .mtn-ignore

Enabling this should be safe since we will ship separate installers for
Win/non-Win. Those that don't want to build the EXEs can set noEXE in build.properties,
Even better might be to run one of
* ant installer-freebsd
* ant installer-linux
* ant installer-nowindows
* ant installer-osx

Jetty 6 package.

- Add several jars from the Jetty 6 distribution
- Update jetty.xml
- Add context XML files
- Update WorkingDir to migrate the content XML files
- Update RouterConsoleRunner and LocaleWebAppHandler
- Remove all old Jetty 5.1.15 local mods;
  this will break Seedless using a custom Server() constructor
- Update I2PRequestLog to be a mod of NCSARequestLog from 6.1.26
- Put I2PRequestLog in its own jar
- Copy MultiPartRequest and other required classes from Jetty 5.1.15
  and add it to susimail, as the replacement MultiPartFilter in
  Jetty 6 is difficult to migrate to, and does not support content-type
- Update i2psnark for Jetty 6
- Disable i2psnark RunStandalone, unused and instantiated Jetty 5
- Fix up all webapp build.xml to reference new jars

Not yet working: Plugin/webapp run detection and stopping, eepsite CGI
Not well tested: Plugins, classpaths, webapps

properties file.