docs: def set_feature_generator(self):
          """Generates proteins with quant from the lookup table"""
          self.features = preparation.build_peptidetable(self.lookup,
                                                         self.headerfields,
                                                         self.isobaric,
                                                         self.precursor,
                                                         self.fdr, self.pep,
                                                         self.genecentric)