Changes by: Jason J. Hickey (jyh at cs.caltech.edu)
Date: 2007-06-06 14:55:50 -0700 (Wed, 06 Jun 2007)
Revision: 10902
Log message:

      Restore the current directory after executing a .SUBDIRS,
     addressing bug #670.
     
     That is, the following does not export the current directory.
     
         .SUBDIRS: a
             export
     
     But the following does.
     
         section
             cd a
             export