AutoContrast filter histogram calculation bug

[William Steidtmann]

Attached is a patch that fixes the AutoContrast filter to use the image 
bounds rather than exactBounds when obtaining histogram data, however 
there is an additional bug that occurs after the Apply button is 
pressed, which causes the transfer function (which should now be 
correct) to apply incorrectly.  It is not clear to me why this 
additional bug exists.

William Steidtmann
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