+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
+it's not defined, then the manifest constant YLOG_DEFAULT_LEVEL is
+used as before. So, for example, to omit warnings from YAZ logging,
+ export YAZ_LOG=-warn
+
cql_transform() now map structure and other attributes before indexes,
so that index-specific structures and other attributes can override
defaults. So now a combination of mapping specifications such as: