+ * Revision 1.20 1999-05-26 07:49:14 adam
+ * C++ compilation.
+ *
+ * Revision 1.19 1999/02/02 14:51:34 adam
+ * Updated WIN32 code specific sections. Changed header.
+ *
+ * Revision 1.18 1998/03/05 08:36:28 adam
+ * New result set model.
+ *
+ * Revision 1.17 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 1.16 1997/10/31 12:37:01 adam
+ * Code calls xfree() instead of free().
+ *
+ * Revision 1.15 1996/10/29 13:55:22 adam
+ * Include of zebrautl.h instead of alexutil.h.
+ *
+ * Revision 1.14 1995/12/11 09:15:24 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 1.13 1995/10/12 12:41:56 adam
+ * Private info (buf) moved from struct rset_control to struct rset.
+ * Bug fixes in relevance.
+ *
+ * Revision 1.12 1995/10/10 14:00:04 adam
+ * Function rset_open changed its wflag parameter to general flags.
+ *
+ * Revision 1.11 1995/10/06 14:38:05 adam
+ * New result set method: r_score.
+ * Local no (sysno) and score is transferred to retrieveCtrl.
+ *
+ * Revision 1.10 1995/09/08 14:52:42 adam
+ * Work on relevance feedback.
+ *
+ * Revision 1.9 1995/09/07 13:58:43 adam
+ * New parameter: result-set file descriptor (RSFD) to support multiple
+ * positions within the same result-set.
+ * Boolean operators: and, or, not implemented.
+ *
+ * Revision 1.8 1995/09/06 16:11:56 adam