RFC - Tk::DualLists

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Hello,

    I recently had need to implement two list widgets with
the ability to move items between them.  There didn't seem
to be a comparable widget out on CPAN.  So, rather than just
put the code in the script, it was made into a module.

    It is attached with a test program as well.  The main pieces
are there.  A couple of small issues like custom sorting
of the lists, allowing duplicate entries, etc. need to be
implemented to make it more flexible.  Also the ability to
display a widget allowing the user to add items without
needing to write extra code would be nice.

    If any of the more knowledgeable Tk hackers would care to
comment, I'd appreciate it.  Tips, pointers, suggestions and
even gentle flames welcome...  If you have any serious flaming
to do, please wait until December or January.  The additional
heat will be welcome in the New England weather  ;-)

    Thanks in advance.

- Todd

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