Completely different fix for SF bug #243 that has the benefit of not
completely breaking Itk and Iwidgets. :)
Revised the new fix for bug 243 to something gentler and less potentially
far-reaching.  Testing desired.
[sf 259] Fix uplevel by getting call frame clientdata from varFramePtr
and not framePtr.
Add test for SF bug 259.
merge trunk, update ChangeLog