Itk - the [incr Tk] extension

Thanks for the report.

I won't be on a system where I can easily work on this until
Wednesday, I think, maybe Thursday.

Unless this is really an Itcl problem, and a demo can be
crafted that doesn't demand Itk.  I could work on that
with the systems I have now.

At that point we'll have to see whether a fix is within reach
without putting too much delay on getting the existing set
of fixes out in a release.