Python 2.6 report

[Paul Moore]

I've just run the test suite with the newly released Python 2.6. The
main issue is that os.popenXX is deprecated now, and issues a
DeprecationWarning. No tests fail other than for this reason (I'm
still trying to determine a good way of suppressing the warning
globally, so that I can confirm this by an easier method than manually
scanning the errors... :-(

Would a patch to use the subprocess module in preference to os.popenXX
in Python 2.6 be useful? If so, I'll see what I can do.

Paul.