Possible compatibility problems with earlier versions marked with '*'.
+--- 2.1.6 2005/05/24
+
+Added support for SRW sort in Generic Frontend Server. Patch
+by Ko van der Sloot. Member srw_sortKeys in bend_search_rr holds
+sortKeys - or NULL if none is provided.
+
Fixed bug #307: It was impossible to specify indefinite/no timeout
for ZOOM_event. Special timeout value -1 now means indefinite timeout
(i.e. no timeout).