+ * Revision 1.17 1995-10-13 16:01:49 adam
+ * Work on relations.
+ *
+ * Revision 1.16 1995/10/10 12:24:38 adam
+ * Temporary sort files are compressed.
+ *
+ * Revision 1.15 1995/10/04 16:57:19 adam
+ * Key input and merge sort in one pass.
+ *
+ * Revision 1.14 1995/09/29 14:01:40 adam
+ * Bug fixes.
+ *
+ * Revision 1.13 1995/09/28 14:22:56 adam
+ * Sort uses smaller temporary files.
+ *
+ * Revision 1.12 1995/09/28 12:10:32 adam
+ * Bug fixes. Field prefix used in queries.
+ *
+ * Revision 1.11 1995/09/27 12:22:28 adam
+ * More work on extract in record control.
+ * Field name is not in isam keys but in prefix in dictionary words.
+ *
+ * Revision 1.10 1995/09/14 07:48:23 adam
+ * Record control management.
+ *
+ * Revision 1.9 1995/09/11 13:09:33 adam
+ * More work on relevance feedback.
+ *
+ * Revision 1.8 1995/09/08 14:52:27 adam
+ * Minor changes. Dictionary is lower case now.
+ *
+ * Revision 1.7 1995/09/06 16:11:16 adam
+ * Option: only one word key per file.
+ *
+ * Revision 1.6 1995/09/05 15:28:39 adam
+ * More work on search engine.
+ *
+ * Revision 1.5 1995/09/04 12:33:42 adam
+ * Various cleanup. YAZ util used instead.
+ *
+ * Revision 1.4 1995/09/04 09:10:35 adam
+ * More work on index add/del/update.
+ * Merge sort implemented.
+ * Initial work on z39 server.
+ *
+ * Revision 1.3 1995/09/01 14:06:35 adam
+ * Split of work into more files.
+ *
+ * Revision 1.2 1995/09/01 10:30:24 adam
+ * More work on indexing. Not working yet.
+ *
+ * Revision 1.1 1995/08/31 14:50:24 adam