-Changed the way PQF queries are encoded in SRU GET/POST. PQF search
-before: x-pquery=pqf . PQF search now: query=pqf&x-querytype=pqf . This
-makes the SRU request more conformant because the required query parameter
-is always present. PQF scan before: x-pScanClause=pqf . PQF scan now:
-scanClause=pqf&x-querytype=pqf .
-