• #642: Add MySQL database hook "add_drop_database" configuration option to control whether dumped
  MySQL databases get dropped right before restore.
• #643: Fix for potential data loss (data not getting backed up) when dumping large "directory"
  format PostgreSQL/MongoDB databases. Prior to the fix, these dumps would not finish writing to
  disk before Borg consumed them. Now, the dumping process completes before Borg starts. This only
  applies to "directory" format databases; other formats still stream to Borg without using
  temporary disk space.
• Fix MongoDB "directory" format to work with mongodump/mongorestore without error. Prior to this
  fix, only the "archive" format worked.