+ * Revision 1.26 1996-06-04 10:19:01 adam
+ * Minor changes - removed include of ctype.h.
+ *
+ * Revision 1.25 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 1.24 1996/04/26 10:00:23 adam
+ * Added option -V to zebraidx to display version information.
+ * Removed stupid warnings from file update.
+ *
+ * Revision 1.23 1996/04/12 07:02:25 adam
+ * File update of single files.
+ *
+ * Revision 1.22 1996/04/09 06:50:50 adam
+ * Bug fix: bad reference in function fileUpdateR.
+ *
+ * Revision 1.21 1996/03/22 15:34:18 quinn
+ * Fixed bad reference
+ *
+ * Revision 1.20 1996/03/21 14:50:10 adam
+ * File update uses modify-time instead of change-time.
+ *
+ * Revision 1.19 1996/03/20 16:16:55 quinn
+ * Added diagnostic output
+ *
+ * Revision 1.18 1996/03/19 12:43:27 adam
+ * Bug fix: File update traversal didn't handle trailing slashes correctly.
+ * Bug fix: Update of sub directory groups wasn't handled correctly.
+ *
+ * Revision 1.17 1996/02/12 18:45:17 adam
+ * Changed naming of some functions.
+ *
+ * Revision 1.16 1996/02/05 12:30:02 adam
+ * Logging reduced a bit.
+ * The remaining running time is estimated during register merge.
+ *
+ * Revision 1.15 1995/12/07 17:38:48 adam
+ * Work locking mechanisms for concurrent updates/commit.
+ *
+ * Revision 1.14 1995/12/06 12:41:26 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 1.13 1995/11/28 09:09:46 adam
+ * Zebra config renamed.
+ * Use setting 'recordId' to identify record now.
+ * Bug fix in recindex.c: rec_release_blocks was invokeded even
+ * though the blocks were already released.
+ * File traversal properly deletes records when needed.
+ *
+ * Revision 1.12 1995/11/24 11:31:37 adam
+ * Commands add & del read filenames from stdin if source directory is
+ * empty.
+ * Match criteria supports 'constant' strings.
+ *
+ * Revision 1.11 1995/11/22 17:19:19 adam
+ * Record management uses the bfile system.
+ *
+ * Revision 1.10 1995/11/21 15:01:16 adam
+ * New general match criteria implemented.
+ * New feature: document groups.
+ *
+ * Revision 1.9 1995/11/21 09:20:32 adam
+ * Yet more work on record match.
+ *
+ * Revision 1.8 1995/11/20 16:59:46 adam
+ * New update method: the 'old' keys are saved for each records.
+ *
+ * Revision 1.7 1995/11/20 11:56:28 adam
+ * Work on new traversal.
+ *
+ * Revision 1.6 1995/11/17 15:54:42 adam
+ * Started work on virtual directory structure.
+ *
+ * Revision 1.5 1995/10/17 18:02:09 adam
+ * New feature: databases. Implemented as prefix to words in dictionary.
+ *
+ * Revision 1.4 1995/09/28 09:19:46 adam
+ * xfree/xmalloc used everywhere.
+ * Extract/retrieve method seems to work for text records.
+ *
+ * Revision 1.3 1995/09/06 16:11:18 adam
+ * Option: only one word key per file.
+ *
+ * Revision 1.2 1995/09/04 12:33:43 adam