• Added $wgDebugLogPrefix, to allow users (or in this case, multiprocess command-line scripts) to set a debug log line prefix
• Improved blob_tracking.sql docs
• Allow testCompression.php to run until happy instead of a specified revision count
• Added docs for some debugging globals in DefaultSettings.php

In experimental script recompressTracked.php:

• Fixed crippling bugs, seems to work now. Needs more testing.
• Improved usage documentation
• Use DiffHistoryBlob by default if available
• Set a process-specific log prefix, added more debugging output
• Optimised commit() slightly by merging the locking read queries using IN()
• Fixed finishIncompleteMoves() so doPage() acts on only that page. Also run finishIncompleteMoves() for orphan lists.