+Wed May 3 23:05:31 2006 Ben Pfaff <blp@gnu.org>
+
+ Continue reforming procedure execution. In this phase, get rid of
+ many global variables, consolidating procedure execution in
+ procedure.c. Encapsulate transformations in new "struct
+ trns_chain". Also, change implementation of N OF CASES, FILTER,
+ and PROCESS IF from special cases to transformations.
+
+ * aggregate.c (cmd_aggregate) Use discard_variables().
+
+