If the environment variable YAZ_LOG is set, then it is used as a
string indicating the default level of logging to use if not
overridden by calls to yaz_log_init() or yaz_log_init_level(). If
If the environment variable YAZ_LOG is set, then it is used as a
string indicating the default level of logging to use if not
overridden by calls to yaz_log_init() or yaz_log_init_level(). If