BUGCHECK log messages now include file name and line number. (A. Brinkman)

Routines that print out various internal structures (DSQL node tree, BLR, DYN, etc) have been updated. (N. Samofatov)

Thread-safe and signal-safe debug logging facilities have been implemented. (N. Samofatov)

Syslog messages will be copied to the user's tty if a process is attached to it. (A. Peshkov)