Restores utool print functions to python defaults

def stop_logging():
    """
    Restores utool print functions to python defaults
    """
    global __UTOOL_ROOT_LOGGER__
    global __UTOOL_PRINT__
    global __UTOOL_WRITE__
    global __UTOOL_FLUSH__
    if __UTOOL_ROOT_LOGGER__ is not None:
        # Flush remaining buffer
        if VERBOSE or LOGGING_VERBOSE:
            _utool_print()()('<__LOG_STOP__>')
        _utool_flush()()
        # Remove handlers
        for h in __UTOOL_ROOT_LOGGER__.handlers[:]:
            __UTOOL_ROOT_LOGGER__.removeHandler(h)
        # Reset objects
        __UTOOL_ROOT_LOGGER__ = None
        __UTOOL_PRINT__    = None
        __UTOOL_WRITE__    = None
        __UTOOL_FLUSH__    = None