code: def refresh(self):
          
  
          ## clear any existing results files
          oldfiles = [self.files.qdump] + \
                      self.database.__dict__.values() + \
                      self.trees.__dict__.values()
          for oldfile in oldfiles:
              if oldfile:
                  if os.path.exists(oldfile):
                      os.remove(oldfile)
  
          ## store old ipcluster info
          oldcluster = copy.deepcopy(self._ipcluster)
  
          ## reinit the tetrad object data.
          self.__init__(
              name=self.name, 
              data=self.files.data, 
              mapfile=self.files.mapfile,
              workdir=self.dirs,
              method=self.params.method,
              guidetreefile=self.files.guidetreefile,
              resolve=self._resolve, 
              nboots=self.params.nboots, 
              nquartets=self.params.nquartets, 
              initarr=True, 
              quiet=True,
              cli=self.kwargs.get("cli")
              )
  
          ## retain the same ipcluster info
          self._ipcluster = oldcluster
docs: Remove all existing results files and reinit the h5 arrays 
          so that the tetrad object is just like fresh from a CLI start.