+Definition of wrbuf_diags moved to querytowrbuf.h. Function wrbuf_put_zquery
+removed, because function yaz_query_to_wrbuf does the same.
+
API changes to ZOOM. Functions for setting options returns int, rather
than void, so we have a way to flag unknown options. ZOOM_resultset_sort1
has become "the" ZOOM_resultset_sort. (and old ZOOM_resultset_sort is removed).