Internal method to format values in the packmol parameter dictionaries

        Args:
              param_val:
                   Some object to turn into String

        Returns:
               string representation of the object

def _format_param_val(self, param_val):
        """
        Internal method to format values in the packmol parameter dictionaries

        Args:
              param_val:
                   Some object to turn into String

        Returns:
               string representation of the object
        """
        if isinstance(param_val, list):
            return ' '.join(str(x) for x in param_val)
        else:
            return str(param_val)