urlutils improvements from hpss

[Martin Pool]

> # date: Wed 2007-03-28 07:43:17.453999996 +1000

(incidentally) It looks like the bundle code needs to limit precision
to microseconds here?

> +def joinpath(base, *args):

I might prefer joinurlpath or join_url_path, just to avoid anyone
thinking it can be used on local paths... though I guess it can on
unix, but not safely on Windows?

Assuming it does what the tests say, +1

-- 
Martin