transaction: write pending generated files
Such file are generated with a .pending prefix. It is up to the reader to
implement the necessary logic for reading pending files.
We add a test to ensure pending files are properly cleaned-up in both success and
error cases.
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.