* This utility required to reset foregroup pgrp as needed in src/terminal.cpp.

 * This utility required to reset foregroup pgrp as needed in src/terminal.cpp.

     * Sometimes 'dmtcp_launch' is called from inside a shell script
       (e.g., for a batch job).  In this case, on restart, the foreground
       process group leader is the restarted process, and yet the
       process group leader is the parent (presumably the login shell).
       So, the foreground process group leader is not the leader of a
       process group.  To fix this, we set the process group leader to
       also be the leader of the foreground process group.