[ENH] Debugger showing objects on the stack ( [sm][et] Added changeset, works for me )

[mike at mjr104.co.uk]

I don't think this originally came in as an attachment so I've added it
(assuming this is helpful).

I've always wanted this feature and it's useful for me.  I don't know
too much about the debugger but it seems to be a small and local change.
 I've tested it on various expressions and it seems to work.
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