Makes a small text amenable to being used in a filename.

def _str_replace(txt):
        """Makes a small text amenable to being used in a filename."""
        txt = txt.replace(",", "")
        txt = txt.replace(" ", "_")
        txt = txt.replace(":", "")
        txt = txt.replace(".", "")
        txt = txt.replace("/", "")
        txt = txt.replace("", "")
        return txt