* lang/python/doc/meta/TODO.org: Added the two major documentation
  build system tasks to the TODO list.
* Added an index page in preparation for sorting out the second of
  those TODO lists (Docutils is a lot easier to handle than Texinfo).
* Meanwhile, have confirmed that it all builds just fine under
  GNU/Linux, OS X and FreeBSD while retaining the documentation, so
  that's a nice improvement from 1.11.1.