This was a not-too-busy cycle for documentation; highlights include:

- The beginnings of a set of translations into Spanish, headed up by Carlos
  Bilbao.

- More Chinese translations.

- A change to the Sphinx "alabaster" theme by default for HTML generation.
  Unlike the previous default (Read the Docs), alabaster is shipped with
  Sphinx by default, reducing the number of other dependencies that need to
  be installed.  It also (IMO) produces a cleaner and more readable result.

- The ability to render the documentation into the texinfo format
  (something Sphinx could always do, we just never wired it up until now).

Plus the usual collection of typo fixes, build-warning fixes, and minor
updates.
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