py3: flush stdout
This avoids buffering due to mixed print() and sys.stdout.write() by
profiling code.
And with this, test-profile.t passes on Python 3 \o/.
Honestly, I'd be shocked if there weren't more Python 3 encoding issues lingering
in the profiling code. That code isn't super high quality and doesn't seem to have
thorough test coverage.
Differential Revision: https://phab.mercurial-scm.org/D5018
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.