+ * Revision 1.58 1998-06-08 14:43:13 adam
+ * Added suport for EXPLAIN Proxy servers - added settings databasePath
+ * and explainDatabase to facilitate this. Increased maximum number
+ * of databases and attributes in one register.
+ *
+ * Revision 1.57 1998/05/20 10:12:18 adam
+ * Implemented automatic EXPLAIN database maintenance.
+ * Modified Zebra to work with ASN.1 compiled version of YAZ.
+ *
+ * Revision 1.56 1998/03/05 08:45:12 adam
+ * New result set model and modular ranking system. Moved towards
+ * descent server API. System information stored as "SGML" records.
+ *
+ * Revision 1.55 1998/01/26 10:37:34 adam
+ * Minor changes.
+ *
+ * Revision 1.54 1998/01/12 15:04:08 adam
+ * The test option (-s) only uses read-lock (and not write lock).
+ *
+ * Revision 1.53 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 1.52 1997/10/31 12:34:04 adam
+ * Added missing nmem_init.
+ *
+ * Revision 1.51 1997/10/27 14:33:05 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 1997/09/25 14:55:52 adam
+ * Minor changes.
+ *
+ * Revision 1.49 1997/09/17 12:19:15 adam
+ * Zebra version corresponds to YAZ version 1.4.
+ * Changed Zebra server so that it doesn't depend on global common_resource.
+ *
+ * Revision 1.48 1997/09/09 13:38:08 adam
+ * Partial port to WIN95/NT.
+ *
+ * Revision 1.47 1997/02/12 20:39:46 adam
+ * Implemented options -f <n> that limits the log to the first <n>
+ * records.
+ * Changed some log messages also.
+ *
+ * Revision 1.46 1997/02/10 10:20:13 adam
+ * Flag fileVerboseFlag set to 0 (default).
+ *
+ * Revision 1.45 1996/11/08 11:10:26 adam
+ * Buffers used during file match got bigger.
+ * Compressed ISAM support everywhere.
+ * Bug fixes regarding masking characters in queries.
+ * Redesigned Regexp-2 queries.
+ *
+ * Revision 1.44 1996/10/29 14:09:48 adam
+ * Use of cisam system - enabled if setting isamc is 1.
+ *
+ * Revision 1.43 1996/06/06 12:08:42 quinn
+ * Added showRecord function
+ *
+ * Revision 1.42 1996/05/31 09:07:01 quinn
+ * Work on character-set handling
+ *
+ * Revision 1.41 1996/05/14 14:04:34 adam
+ * In zebraidx, the 'stat' command is improved. Statistics about ISAM/DICT
+ * is collected.
+ *
+ * Revision 1.40 1996/04/26 10:00:23 adam
+ * Added option -V to zebraidx to display version information.
+ * Removed stupid warnings from file update.
+ *
+ * Revision 1.39 1996/04/09 10:05:21 adam
+ * Bug fix: prev_name buffer possibly too small; allocated in key_file_init.
+ *
+ * Revision 1.38 1996/03/26 16:01:14 adam
+ * New setting lockPath: directory of various lock files.
+ *
+ * Revision 1.37 1996/03/19 12:43:26 adam
+ * Bug fix: File update traversal didn't handle trailing slashes correctly.
+ * Bug fix: Update of sub directory groups wasn't handled correctly.
+ *
+ * Revision 1.36 1996/02/12 18:45:37 adam
+ * New fileVerboseFlag in record group control.
+ *
+ * Revision 1.35 1996/02/12 15:56:11 adam
+ * New code command: unread.
+ *
+ * Revision 1.34 1996/02/07 14:06:39 adam
+ * Better progress report during register merge.
+ * New command: clean - removes temporary shadow files.
+ *
+ * Revision 1.33 1996/02/06 17:11:18 adam
+ * Minor changes.
+ *
+ * Revision 1.32 1996/02/01 20:50:04 adam
+ * Bug fix: zebraIndexUnlock was always called even though zebraIndexLock
+ * was never called - happens when no commands are specified.
+ *
+ * Revision 1.31 1996/01/08 19:15:46 adam
+ * New input filter that works!
+ *
+ * Revision 1.30 1995/12/12 16:00:59 adam
+ * System call sync(2) used after update/commit.
+ * Locking (based on fcntl) uses F_EXLCK and F_SHLCK instead of F_WRLCK
+ * and F_RDLCK.
+ *
+ * Revision 1.29 1995/12/11 11:43:30 adam
+ * Locking based on fcntl instead of flock.
+ * Setting commitEnable removed. Command line option -n can be used to
+ * prevent commit if commit setting is defined in the configuration file.
+ *
+ * Revision 1.28 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 1.27 1995/12/07 17:38:47 adam
+ * Work locking mechanisms for concurrent updates/commit.
+ *
+ * Revision 1.26 1995/12/06 12:41:23 adam
+ * New command 'stat' for the index program.
+ * Filenames can be read from stdin by specifying '-'.
+ * Bug fix/enhancement of the transformation from terms to regular
+ * expressons in the search engine.
+ *
+ * Revision 1.25 1995/12/01 16:24:39 adam
+ * Commit files use separate meta file area.
+ *
+ * Revision 1.24 1995/11/30 17:01:38 adam
+ * New setting commitCache: points to commit directories/files.
+ * New command commit: commits at the end of a zebraidx run.
+ *
+ * Revision 1.23 1995/11/30 08:34:31 adam
+ * Started work on commit facility.
+ * Changed a few malloc/free to xmalloc/xfree.
+ *
+ * Revision 1.22 1995/11/28 09:09:42 adam