gendoc: guarantee that all commands were processed The new logic renders the commands belonging to each category in turn. Commands with an unregistered category are at risk of getting skipped because their category is not in the list. By comparing the list of all commands to a log of processed commands, we can detect commands with unregistered categories and fail with an error message. Differential Revision: https://phab.mercurial-scm.org/D6327

Mercurial's documentation is kept in reStructuredText format, which is
a simple plain text format that's easy to read and edit:

  http://docutils.sourceforge.net/rst.html

It's also convertible to a variety of other formats including standard
UNIX man page format and HTML. You'll need to install Docutils:

  http://docutils.sourceforge.net/

Use the Makefile in this directory to generate the man and HTML pages.