Hi guys,

one of our users complained that he cannot enter the variance of 0.5 to
the basic image processing Gaussian filter. And indeed, for Gaussian
image filter, the normal spinbox is used as an imput even though itk
accepts a double. Similar thing could be said for gradient filter. Is
there any specific reason for this? If not, find a simple patch attached.

All best,

Rostislav.

PS: that file desperately needs some refactoring, but I guess you know it :)