The manual now used better the org.css file. It also reacts to single
key presses like "n" and "p", and has a top-level table of contents
that is always active and visible.
A new perl program, list-hooks.pl, now extracts the full list of hook
and function variables in Org, for inclusion into Worg's org-hooks.org.
Also, add a docstring to a few hooks that did not have one.
This required changing the Makefile.
I also added a new program set-version.pl that can be used
to synchronize the version number in all core files of the
distribution, along with the web files.