added more details about materials and decay and info about arbitrary agent hierarchies
describe decay shortcut
remove a few therefores and be consisteng about plug-in vs plugin
todo note
add more recycle scenario details. Added in some xml snippets
discuss pu buildup data
editing intro
improvements to intro
intro done
more intro
background edits
improved discussion of background
spellcheck
cleaning up
motivation
cleanup
no
erasing out of date comments
cleaning up implementation, adding content
filling in examples intro.