+ * 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