Some experimental (currently disabled) PHP code to connect using Curl

instead of using stream_context_create(). This has the advantage of
being able to force the use of the TLSv1 protocol, but doesn't seem
to have a decent error handling mechanism, so isn't yet a workable
alternative.

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Imported using git-svn from
https://dev.csi.cam.ac.uk/svn/lookup/trunk@57