yaz_log_mask_str() converts a comma-separated list of log levels to a
bit mask. Starts from default level, and adds bits as specified,
unless 'none' is specified, which clears the list. If a name matches
the name of a YLOG_BIT above, that one is set. Otherwise a new value is
yaz_log_mask_str() converts a comma-separated list of log levels to a
bit mask. Starts from default level, and adds bits as specified,
unless 'none' is specified, which clears the list. If a name matches
the name of a YLOG_BIT above, that one is set. Otherwise a new value is