TODO

So, our TODO list is now in /TIMELINE.md. It uses the todo-format that github likes:

- [x] done
- [ ] undone

I sorted through it, pruning and shuffling. Future work is down at the bottom, and questions we have down below that. As you think of things to add, stuff them in; as you complete tasks, tag them too. We're about halfway through the current list of tasks, and after dropping the Gibbs sampler as an immediate goal I am confident we will be able to accomplish (though Friday is going to be a mad rush of collecting plots and organizing the code into something that is reusable (which I've tenatively written down as "make packages", though Lysy said he didn't expect we would be able to accomplish that step by Friday))

This push also includes a new `util.R` file--put helper functions that are not directly related to the distribution in there--and marginalize() which took up all my day yesterday but is too slow to use, and a couple of documentation tweaks (including `docs/code_notes.md` wherein I'll log the results of the experiment I said I would do about references).

I want to split NIW into subfiles now because it's gotten too large to find missing braces in quickly. Are you working much in NIW.R?