code: def library_sequencing_results(self):
          
          sres_ids = self.sequencing_result_ids
          res = {}
          for i in sres_ids:
              sres = SequencingResult(i)
              res[sres.library_id] = sres
          return res
docs: Generates a dict. where each key is a Library ID on the SequencingRequest and each value
          is the associated SequencingResult. Libraries that aren't yet with a SequencingResult are
          not inlcuded in the dict.