DIAGNOSTICS CHECK_KEY_MARKS for unexpected key marks
DIAGNOSTICS FALG_ERR added to diagnose FALG_ERR
DIAGNOSTICS FILE_CLOSE_FLUSH turns on diagnostic logging of flush during file close
DIAGNOSTICS LOWL_FILE_IO corrected to output messages for missing files
DIAGNOSTICS MEMTRACK is now deprecated
DIAGNOSTICS NODEQ_MESSAGE improved detail of delete node queue diagnostics
DIAGNOSTICS POPN_ERR outputs stack trace diagnostics on pending open error
DIAGNOSTICS READ_ERR functionality extended for standalone use
DIAGNOSTICS UPDFLG identifies when a file is marked corrupt with additional point of occurrence logging