Remove hkit and do our own hcard parsing
Parsing hcards for the data we need wasn't hard enough to justify using hkit. It was dependent on a number of external systems (something to run tidy), and only could handle XHTML. We now parse HTML with the PHP dom libraries used elsewhere, and scrape out our own hcards. Seems to work nicer and faster and most of all works with Google Buzz profile URLs.
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