perf: prepare to handle multiple pairs in perfbdiff
Before, we only supported benchmarking a single pair of texts
with bdiff. We want to enable feeding larger corpora into this
benchmark. So rewrite the code to support that.
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.