Ann: condition pack

I've released an experimental implementation of Common Lisp's condition
system for SWI Prolog.  If you're not familiar with conditions, the pack
documentation <http://www.swi-prolog.org/pack/list?p=condition> introduces
them a little.

Anyway, my experience with Common Lisp conditions is minimal, so I mostly
wanted to solicit ideas from the list: how should condition-restart be
supported in Prolog?  I made a few adjustments to support backtracking
where it seemed productive.

I'm also interested in real world experience using condition systems to
handle errors.  I'm not yet using this library in production and would love
to avoid pitfalls that others have discovered.

Thanks.

-- 
Michael
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