+ * Revision 1.23 1997-12-18 10:54:25 adam
+ * New method result set method rs_hits that returns the number of
+ * hits in result-set (if known). The ranked result set returns real
+ * number of hits but only when not combined with other operands.
+ *
+ * Revision 1.22 1997/10/31 12:38:12 adam
+ * Bug fix: added missing xfree() call.
+ *
+ * Revision 1.21 1997/09/17 12:19:23 adam
+ * Zebra version corresponds to YAZ version 1.4.
+ * Changed Zebra server so that it doesn't depend on global common_resource.
+ *
+ * Revision 1.20 1997/09/09 13:38:17 adam
+ * Partial port to WIN95/NT.
+ *
+ * Revision 1.19 1997/09/04 13:58:57 adam
+ * Added O_BINARY for open calls.
+ *
+ * Revision 1.18 1996/10/29 13:54:52 adam
+ * Changed name of setting tempSetDir to setTmpDir.
+ *
+ * Revision 1.17 1995/12/11 09:15:28 adam
+ * New set types: sand/sor/snot - ranked versions of and/or/not in
+ * ranked/semi-ranked result sets.
+ * Note: the snot not finished yet.
+ * New rset member: flag.
+ * Bug fix: r_delete in rsrel.c did free bad memory block.
+ *
+ * Revision 1.16 1995/11/28 14:47:02 adam
+ * New setting: tempSetPath. Location of temporary result sets.
+ *
+ * Revision 1.15 1995/10/12 12:41:58 adam
+ * Private info (buf) moved from struct rset_control to struct rset.
+ * Bug fixes in relevance.
+ *
+ * Revision 1.14 1995/10/10 14:00:04 adam
+ * Function rset_open changed its wflag parameter to general flags.
+ *
+ * Revision 1.13 1995/10/06 14:38:06 adam
+ * New result set method: r_score.
+ * Local no (sysno) and score is transferred to retrieveCtrl.
+ *
+ * Revision 1.12 1995/09/28 09:52:11 adam
+ * xfree/xmalloc used everywhere.
+ *
+ * Revision 1.11 1995/09/18 14:17:56 adam
+ * Bug fixes.
+ *
+ * Revision 1.10 1995/09/15 14:45:39 adam
+ * Bug fixes.
+ *
+ * Revision 1.9 1995/09/15 09:20:42 adam
+ * Bug fixes.
+ *
+ * Revision 1.8 1995/09/08 14:52:42 adam
+ * Work on relevance feedback.
+ *
+ * Revision 1.7 1995/09/07 13:58:44 adam
+ * New parameter: result-set file descriptor (RSFD) to support multiple
+ * positions within the same result-set.
+ * Boolean operators: and, or, not implemented.
+ *
+ * Revision 1.6 1995/09/06 16:11:56 adam
+ * More work on boolean sets.
+ *
+ * Revision 1.5 1995/09/05 16:36:59 adam
+ * Minor changes.
+ *
+ * Revision 1.4 1995/09/05 11:43:24 adam