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[plt-dev] overriding constructor style printing

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Tue Mar 3 21:55:39 EST 2009		 
I've added `prop:print-converter' to `mzlib/pconvert-prop' in SVN. You
can use it like this:

 (define-struct unordered (elems)
    ....
    #:property prop:print-converter (lambda (v recur)
                                      `(bag ,@(map recur (unordered-elems v))))
    ....)
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