docs: def load(self, specfiles=None):
          """Imports the specified ``fic`` files from the hard disk.
  
          :param specfiles: the name of an ms-run file or a list of names. If None
              all specfiles are selected.
          :type specfiles: None, str, [str, str]
          """
          if specfiles is None:
              specfiles = [_ for _ in viewkeys(self.info)]
          else:
              specfiles = aux.toList(specfiles)
  
          for specfile in specfiles:
              if specfile not in self.info:
                  warntext = 'Error while calling "FiContainer.load()": "%s" is'\
                             ' not present in "FiContainer.info"!'\
                              % (specfile, )
                  warnings.warn(warntext)
                  continue
              else:
                  fiPath = aux.joinpath(self.info[specfile]['path'],
                                        specfile+'.fic'
                                        )
                  with zipfile.ZipFile(fiPath, 'r') as containerZip:
                      #Convert the zipfile data into a str object, necessary since
                      #containerZip.read() returns a bytes object.
                      jsonString = io.TextIOWrapper(containerZip.open('data'),
                                                    encoding='utf-8'
                                                    ).read()
                      #infoString = io.TextIOWrapper(containerZip.open('info'),
                      #                              encoding='utf-8'
                      #                              ).read()
                  self.container[specfile] = json.loads(jsonString,
                                                        object_hook=Fi.jsonHook
                                                        )