filelog: censored files compare against empty data, have 0 size
To support "status" operations against working directories that are
the children of censored revisions, filelog must define "cmp" and "size"
for censored content.
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.