Bugfix: code listings and figure display

Adds an 'end' marker to stop code listings from displaying the
entire file. Also moves the model-selection graphs to the right
part of the file.
Version 0.7.2 released

* Bugfix: successfully remove ligatures from monospaced text
* Convert most of the R code to Julia. (Everything except what's in
  the Bayesian material so far.)
* Decrease margins and increase font to reduce page count while
  keeping the text readable.
* Reorganize the material within each part and change the formatting
  from "parts" to "chapters" to decrease pagecount.
* Remove the AUTHORS.tex file (until there's another author).
* Moves the FDL to the end of the book (after the bibliography) to
  make it easier to avoid printing.