docs: def _containerSetPath(container, folderpath, specfiles):
      """Helper function for :class:`MsrunContainer`, :class:`SiiContainer` and
      :class:`FiContainer`. Changes the folderpath of the specified specfiles in
      container.info: ``container.info[specfile]['path'] = folderpath``.
  
      :param container: a container like class that has an attribute ``.info``
      :param folderpath: a filedirectory
      :param specfiles: a list of ms-run names
      """
      if not os.path.exists(folderpath):
          warntext = 'Error while calling "_containerSetPath()": The specified '\
                     'directory "%s" does not exist!' %(folderpath, )
          warnings.warn(warntext)
      for specfile in specfiles:
          if specfile in container.info:
              container.info[specfile]['path'] = folderpath
          else:
              warntext = 'Error while calling "_containerSetPath()": The '\
                         'specfile "%s" is not present in the container!'\
                         %(specfile, )
              warnings.warn(warntext)