Add UI control for normalization option

[fedorov]

Feature requested by the user via email:

I have read a number of papers in the field of radiomics and found resamlping and normalization of image volume as a standard of operation in many papers. And I found resamlping as an option in the Radiomics plug-in but normalization not involved. I am wondering if normalization is as the SOP that the plug-in code runs. If not, how can I use the 3D slicer software to perform normalize.