Use rdf:ID instead of rdf:nodeID

FOAF profiles exported by Drupal currently use rdf:nodeID to point to foaf:People, which means that the node refering to the foaf:Person cannot be accessed from the outside of the document.
Using rdf:ID instead could solve it, so that People will have a URI as http://drupal.org/?q=foaf/1#_1 which could be used with foaf:maker property (what we would like to do in the SIOC module)

Nb: The attached patch also includes patch for request http://drupal.org/node/86548
Nb2: In patch, foaf.module is the new version while foaf.patch.sav the current module one