Committing mostly-complete fix to PRs 598/788 (automatically run rescue DAGs for nested DAGs).  I'm committing this now to get it into CVS, but everything is turned off by default and the old behavior still happens -- the new behavior can be turn on with config macros or command-line flags.  The new behavior will be turned on by default after code review and documentation.
Committing mostly-complete fix to PRs 598/788 (automatically run
rescue DAGs for nested DAGs).  I'm committing this now to get it
into CVS, but everything is turned off by default and the old
behavior still happens -- the new behavior can be turn on with
config macros or command-line flags.  The new behavior will be
turned on by default after code review and documentation.

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