Mercurial scmtool http update

Review Request #474 — Created July 28, 2008 and submitted — Latest diff uploaded

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When accessing a Mercurial Repo via http, a FileNotFoundError was being throw, this was due to an api incompatibility.
Tested on both of my mercurial repos. Hosted at http://bitbucket.org Unfortunately, I do not have access to any other HTTP repos at this time.