Updates for BACKUP TABLE/RESTORE TABLE
    Added Replication FAQ
    Cleaned up TODO list removing a duplicate and features already implemented
    Updated changelog for 3.23.25
sql/sql_lex.h
    Re-added backup_dir to Lex which dispappeared while resovling conflicts


Docs/manual.texi:
  Updates for BACKUP TABLE/RESTORE TABLE
  Added Replication FAQ
  Cleaned up TODO list removing a duplicate and features already implemented
  Updated changelog for 3.23.25
sql/sql_lex.h:
  Re-added backup_dir to Lex which dispappeared while resovling conflicts