Changes by: Aleksey Nogin (nogin at cs.caltech.edu)
Date: 2006-03-01 10:51:13 -0800 (Wed, 01 Mar 2006)
Revision: 8807
Log message:

      - Derived a few Itt_union rules that used to be primitive (for no good
        reason).
      - A few minor changes in "sub" resource improvements.