+ * Revision 1.65 1998-10-18 07:54:54 adam
+ * Additional info added for diagnostics 114 (Unsupported use attribute) and
+ * 121 (Unsupported attribute set).
+ *
+ * Revision 1.64 1998/09/22 10:48:21 adam
+ * Minor changes in search API.
+ *
+ * Revision 1.63 1998/09/02 13:53:21 adam
+ * Extra parameter decode added to search routines to implement
+ * persistent queries.
+ *
+ * Revision 1.62 1998/08/06 14:35:28 adam
+ * Routine bend_deleterequest removed.
+ *
+ * Revision 1.61 1998/06/24 12:16:15 adam
+ * Support for relations on text operands. Open range support in
+ * DFA module (i.e. [-j], [g-]).
+ *
+ * Revision 1.60 1998/06/22 11:36:49 adam
+ * Added authentication check facility to zebra.
+ *
+ * Revision 1.59 1998/06/12 12:22:13 adam
+ * Work on Zebra API.
+ *
+ * Revision 1.58 1998/05/27 16:57:46 adam
+ * Zebra returns surrogate diagnostic for single records when
+ * appropriate.
+ *
+ * Revision 1.57 1998/04/03 14:45:18 adam
+ * Fixed setting of last_in_set in bend_fetch.
+ *
+ * Revision 1.56 1998/03/05 08:45:13 adam
+ * New result set model and modular ranking system. Moved towards
+ * descent server API. System information stored as "SGML" records.
+ *
+ * Revision 1.55 1998/02/10 12:03:06 adam
+ * Implemented Sort.
+ *
+ * Revision 1.54 1998/01/29 13:39:13 adam
+ * Compress ISAM is default.
+ *
+ * Revision 1.53 1998/01/12 15:04:09 adam
+ * The test option (-s) only uses read-lock (and not write lock).
+ *
+ * Revision 1.52 1997/11/18 10:05:08 adam
+ * Changed character map facility so that admin can specify character
+ * mapping files for each register type, w, p, etc.
+ *
+ * Revision 1.51 1997/10/27 14:33:06 adam
+ * Moved towards generic character mapping depending on "structure"
+ * field in abstract syntax file. Fixed a few memory leaks. Fixed
+ * bug with negative integers when doing searches with relational
+ * operators.
+ *
+ * Revision 1.50 1997/09/29 09:08:36 adam
+ * Revised locking system to be thread safe for the server.
+ *
+ * Revision 1.49 1997/09/25 14:57:23 adam
+ * Windows NT port.
+ *
+ * Revision 1.48 1997/09/17 12:19:19 adam
+ * Zebra version corresponds to YAZ version 1.4.
+ * Changed Zebra server so that it doesn't depend on global common_resource.
+ *
+ * Revision 1.47 1997/09/04 13:58:36 adam
+ * New retrieve/extract method tellf (added).
+ * Added O_BINARY for open calls.
+ *
+ * Revision 1.46 1997/07/28 08:30:47 adam
+ * Server returns diagnostic 14 when record doesn't exist.
+ *
+ * Revision 1.45 1996/12/23 15:30:45 adam
+ * Work on truncation.
+ * Bug fix: result sets weren't deleted after server shut down.
+ *
+ * Revision 1.44 1996/12/11 12:08:01 adam
+ * Added better compression.
+ *
+ * Revision 1.43 1996/11/15 15:03:58 adam
+ * Logging of execution speed by using the times(2) call.
+ *
+ * Revision 1.42 1996/11/08 11:10:36 adam
+ * Buffers used during file match got bigger.
+ * Compressed ISAM support everywhere.
+ * Bug fixes regarding masking characters in queries.
+ * Redesigned Regexp-2 queries.
+ *
+ * Revision 1.41 1996/10/29 14:09:56 adam
+ * Use of cisam system - enabled if setting isamc is 1.
+ *
+ * Revision 1.40 1996/06/04 10:19:02 adam
+ * Minor changes - removed include of ctype.h.
+ *
+ * Revision 1.39 1996/05/31 09:07:05 quinn
+ * Work on character-set handling
+ *
+ * Revision 1.38 1996/05/14 11:34:01 adam
+ * Scan support in multiple registers/databases.
+ *
+ * Revision 1.37 1996/05/14 06:16:48 adam
+ * Compact use/set bytes used in search service.
+ *
+ * Revision 1.36 1996/05/01 13:46:37 adam
+ * First work on multiple records in one file.
+ * New option, -offset, to the "unread" command in the filter module.
+ *
+ * Revision 1.35 1996/03/26 16:01:14 adam
+ * New setting lockPath: directory of various lock files.
+ *
+ * Revision 1.34 1996/03/20 09:36:46 adam
+ * Function dict_lookup_grep got extra parameter, init_pos, which marks
+ * from which position in pattern approximate pattern matching should occur.
+ * Approximate pattern matching is used in relevance=re-2.
+ *
+ * Revision 1.33 1996/01/17 14:57:56 adam
+ * Prototype changed for reader functions in extract/retrieve. File
+ * is identified by 'void *' instead of 'int.
+ *
+ * Revision 1.32 1995/12/11 09:12:58 adam
+ * The rec_get function returns NULL if record doesn't exist - will
+ * happen in the server if the result set records have been deleted since
+ * the creation of the set (i.e. the search).
+ * The server saves a result temporarily if it is 'volatile', i.e. the
+ * set is register dependent.
+ *
+ * Revision 1.31 1995/12/08 16:22:56 adam
+ * Work on update while servers are running. Three lock files introduced.
+ * The servers reload their registers when necessary, but they don't
+ * reestablish result sets yet.
+ *
+ * Revision 1.30 1995/12/07 17:38:48 adam
+ * Work locking mechanisms for concurrent updates/commit.
+ *
+ * Revision 1.29 1995/12/04 14:22:32 adam