BUG: fix KWStyle errors in itkVTKVisualize* files

Change-Id: Iacc7ca1b751bcc32dc3e7380ce9991a124cde4c9
BUG: Fix visualization of 3D level-sets

This code was not tested and as expected, it did not work. So now a test has
been added.

Change-Id: I4603eaeea9b776e5e6f1f9c1dcac0198c160e397
Merge topic 'FixBugVis3d'

1b0c5c1 BUG: Fix visualization of 3D level-sets
4efb8a4 BUG: fix KWStyle errors in itkVTKVisualize* files