STYLE: ITK_NIFTI_IO_ANALYZE_FLAVOR is an advanced feature

Author: hjmjohnson

CMakeLists.txt

@@ -310,6 +310,7 @@ if( NOT ("${ITK_NIFTI_IO_ANALYZE_FLAVOR}" STREQUAL "ITK4Warning" OR
          ) )
   set(ITK_NIFTI_IO_ANALYZE_FLAVOR "ITK4Warning" CACHE STRING ${ITK_NIFTI_IO_ANALYZE_FLAVOR_DOC_STRING} FORCE)
 endif()
+mark_as_advanced(ITK_NIFTI_IO_ANALYZE_FLAVOR)
 
 
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