- The filter must merge the different segments in the output
at each AfterThreadedGenerateData call, not at Synthesize step
- GenerateInputRequestedRegion is needed as the filter requires
a padded input region
- Don't save pointers as members when they are not necessary
- Recreate the minipipeline at each iteration for security
- Set the default number of threads to 1, or we have too small
regions

TEST:modify RadiometricAttributesLabelMapFilterExample test parameter, SetReverseOrdering method is waiting for a boolean not a double as input