Prov-WD: Use versionized URLs for W3C standards

[Ole Streicher]

Hi,

although IVOA provenance is not compatible with W3C, the W3C data model
is an important base and reference. We always refer to a certain version
of the W3C standard (W3C Recommendation 30 April 2013); so the links
should be versionized.

The attached patch does this for all relevant bibliography entries,
although only the PROV-DM one is actually used in the document.

Best regards

Ole
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