Merge of ha_innobase.cc from 4.0; This fixes that MySQL doesn't allocate too big buffers when sorting innobase rows
Changed name of variables
NO_FOREIGN_KEY_CHECKS -> FOREIGN_KEY_CHECKS
RELAXED_UNIQUE_CHECKS -> UNIQUE_CHECKS
to avoid confusion with 'not...' variables.
Write name of adminstrator command to slow log.
Added mysqldumpslow to RPM