Added optimzation for clustered index
Fixed bug in UPDATE ... ORDER BY
Fixed handling of UPDATE ... LIMIT


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include/my_global.h:
  Fix for purify/valgrind
myisam/mi_info.c:
  Updated comment
mysql-test/r/group_by.result:
  New test results
mysql-test/r/innodb.result:
  New test results
mysql-test/r/join_outer.result:
  New test results
mysql-test/r/multi_update.result:
  New test results
mysql-test/r/null_key.result:
  New test results
mysql-test/r/update.result:
  New test results
mysql-test/t/group_by.test:
  Added extra explain to 'suspicious' test.
mysql-test/t/innodb.test:
  Added test for UPDATE ... ORDER BY
mysql-test/t/join_outer.test:
  Changed test to be repeatable
mysql-test/t/multi_update.test:
  Slight change of test to catch more bugs
mysql-test/t/update.test:
  Better test for UPDATE ... ORDER BY
sql/field.cc:
  Simple optimization
sql/ha_heap.h:
  Added optimzation for clustered index
sql/ha_innodb.cc:
  Added optimzation for clustered index
sql/ha_innodb.h:
  Added optimzation for clustered index
sql/handler.h:
  Added optimzation for clustered index
sql/item_sum.cc:
  Removed some usage of current_thd
sql/mysqld.cc:
  Fix bug when compiling for purify/valgrind
sql/opt_range.cc:
  Added optimzation for clustered index
sql/records.cc:
  Fixed comment
sql/sql_list.h:
  Fixed comment
sql/sql_select.cc:
  Removed some usage of current_thd
sql/sql_select.h:
  Removed some usage of current_thd
sql/sql_union.cc:
  Removed some usage of current_thd
sql/sql_update.cc:
  Fixed bug in UPDATE ... ORDER BY
  Fixed handling of UPDATE ... LIMIT
support-files/my-huge.cnf.sh:
  Added default size for query cache
support-files/my-large.cnf.sh:
  Added default size for query cache