code: def fix_ofiles(self):
          
          filepaths = self.outdir.list_filepaths()
          #logger.info("in fix_ofiles with filepaths %s" % list(filepaths))
  
          old2new = FilepathFixer().fix_paths(filepaths)
  
          for old, new in old2new.items():
              self.history.info("will rename old %s to new %s" % (old, new))
              os.rename(old, new)
docs: This method is called when the task reaches S_OK.
          It changes the extension of particular output files
          produced by Abinit so that the 'official' extension
          is preserved e.g. out_1WF14 --> out_1WF