add toString to GraphContext (for __show-context)
add more closeness after changes tests
use counts to monitor ArrayAgentSets
add small package-and-test shell script
don't pack200 for quicker testing - should be reverted for applet support
Introduce the Shufflerable concept as opposed to a regular Iterable
explicitely use Shufflerables in GraphContext
keep a set of IDs to speed up contains check in MonitoredArrayAgentSet