upgrade: add '-' in optimization name
The older name `redeltaall` was hard to type and read. The newer form should
be more user-friendly.
We keep backward compatibility with the old form (at least for a while).
Having to use different form depending on the version is very impractical and
error prone.
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.