[vtkusers] bug in vtkImageStack

[Dean Inglis]

last week the attached tcl example worked, but now crashes (on Win 7, VS2010 
release build).
The example is a test for overlaying a binary mask using vtkImageSlice and 
vtkImageStack
classes.  The crash occurs if the stack has only one image slice added to it 
.  The use
case scenario is a vtkImageViewer like class that adds a vtkImageStack to a 
renderer
and has the ability to then add or remove overlay masks to a pre-existing 
image using
the stack's AddImage and RemoveImage API.

Dean 
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