* Set LaTeX headers to enable ligatures and a 12pt font by default.
* Paper size left for regional defaults.
* Using XeLaTeX for easier font control.
* Using default LaTeX font of Latin Main, but that's easy enough to change.
* Updated TODO.
* The entirety of the old TODO has been replaced with either more
relevant tasks or goals for the examples and a more measured
approach to the docs and why, in this project, Org Mode trumps reST,
even though it's Python through and through.
