Added the prototype feature based on the vocabulary interpretation algorithm
Improved the way file:// URI-s are used in the final graph. Although this change does not seem to affect the usage within RDFLib, it is important for the separate RDFLib/pyRdfa package and it is better to have the sources synchronised...
Synchronized with RDFLib: error triples are always copied to the processor graph of caller, too.
Refined the RDFa warnings by treating the @rel/<link> combination separately.