obsutil: move 'allsuccessors' to the new modules
We have a new 'obsutil' module now. We move the high level utility there to bring
'obsolete.py' back to a more reasonable size.
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.