This has been another busy cycle for documentation, with a lot of

build-system thrashing.  That work should slow down from here on out.

- The various scripts and tools for documentation were spread out in
  several directories; now they are (almost) all coalesced under
  tools/docs/.  The holdout is the kernel-doc script, which cannot be
  easily moved without some further thought.

- As the amount of Python code increases, we are accumulating modules that
  are imported by multiple programs.  These modules have been pulled
  together under tools/lib/python/ -- at least, for documentation-related
  programs.  There is other Python code in the tree that might eventually
  want to move toward this organization.

- The Perl kernel-doc.pl script has been removed.  It is no longer used by
  default, and nobody has missed it, least of all anybody who actually had
  to look at it.

- The docs build was controlled by a complex mess of makefilese that few
  dared to touch.  Mauro has moved that logic into a new program
  (tools/docs/sphinx-build-wrapper) that, with any luck at all, will be far
  easier to understand and maintain.

- The get_feat.pl program, used to access information under
  Documentation/features/, has been rewritten in Python, bringing an end to
  the use of Perl in the docs subsystem.

- The top-level README file has been reorganized into a more
  reader-friendly presentation.

- A lot of Chinese translation additions

- Typo fixes and documentation updates as usual
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