Possible compatibility problems with earlier versions marked with '*'.
+Modified the YAZ logging system. The LOG level defines use YLOG_ prefix
+instead of LOG_, due to name clash with syslog(3). The new header for
+YAZ log is <yaz/ylog.h>. The old definitions are kept in <yaz/log.h>
+with all old definitions with values kept - so all applications should
+compile as usual. See "Log" chapter in YAZ manual.
+
--- 2.0.28 2004/11/09
Added yaz_log_time_format which specifies log format using