Changes by: Jason Hickey (jyh at cs.caltech.edu)
Date: 2005-05-10 14:25:43 -0700 (Tue, 10 May 2005)
Revision: 7259
Log message:
      Removed the PRLFiles function.  For now, directories that have a mix
       of normal/MetaPRL .ml files (support/tactics, support/shell, theories/itt)
       use the "export rules" hack.