-ISAMC optimization: indirect block with pointers to all blocks
- in chain. The initial block should include the count as well.
+System number sorting.
+
+Configurable default sorting criteria - used when query is not ranked.
+
+Use first field in sorting, i.e. author.
+
+Size of sort entries should be configurable.
+
+Configurable default search attributes. (zebramap.c)