MEMORY is alias for HEAP for CREATE TABLE ... TYPE=HEAP
Fixed bug in multi-table-update where a row could be updated several times


mysql-test/r/heap.result:
  Test of CREATE TABLE ... type=MEMORY
mysql-test/r/innodb.result:
  Added multi-update-test
mysql-test/r/multi_update.result:
  Added multi-update-test
mysql-test/t/heap.test:
  Test of CREATE TABLE ... type=MEMORY
mysql-test/t/innodb.test:
  Added multi-update-test
mysql-test/t/multi_update.test:
  Added multi-update-test
sql/ha_innodb.h:
  Allow optimzation of multi-table-update also for InnoDB tables
sql/handler.h:
  Allow optimzation of multi-update also for InnoDB tables
sql/key.cc:
  After merge fix
sql/lex.h:
  MEMORY is alias for HEAP
sql/sql_test.cc:
  Fixed wrong printf
sql/sql_update.cc:
  Fixed bug in multi-table-update where a row could be updated several times
sql/sql_yacc.yy:
  MEMORY is alias for HEAP