update issues.scala to point to 5.0.4 issues
comment out intermittently failing HubNet test (see #207)
bin/issues.scala: upgrade dispatch to 0.9.3

on general principle
bin/issues.scala: switch from lift-json to json4s-native

the latter is actually just the former renamed and set free
from Lift; see https://github.com/json4s/json4s
bin/issues.scala: sort issues by kind first
bin/issues.scala: report both open and closed issues
bin/release.sh: point to Java 6 on Linux too
very minor user manual tweaking
fix some nonsensical test code in TestHalt
improvements to task docs
add code tab name in Tabs menu - fix #240
fix some bugs in equality on agents and agentsets

fixes #242
fix comments
fix a test to work in both 2D and 3D
make TestCompiler not be 3D-only anymore

there wasn't any real reason for it to be 3D-only, and the technique
we were using to disable it in 3D doesn't work anymore with ScalaTest
2.0.  so the easiest thing is to just make the tests pass in 3D too
sbt build cleanup: split Autogen in two

the JFlex stuff and the Events stuff didn't really have much
in common. nicer to keep them separate
add a seventh illusion to Optical Illusions
fix RGB primitive description
fix doc for HSB primitive
minor User Manual tweak