allowed parsing of table fields inside aggregate functions
 added new tests of fields resolving in grouping

into serg.mylan:/usr/home/serg/Abk/mysql-4.1

into mysql.com:/dbdata/psergey/mysql-4.1-root-root

 * When executing EXPLAIN, do the same as for the query: convert join type to JT_CONST if keyuse array covers all key parts and all of them are constants.
 * In remove_const, don't remove conditions that depend on some-const-table and current-table.

into sanja.is.com.ua:/home/bell/mysql/bk/work-4.1

into poseidon.(none):/home/tomas/mysql-4.1

into serg.mylan:/usr/home/serg/Abk/mysql-4.1

in ha_commit_trans - why it didn't crash earlier ?

(cannot call it a "merge" :)

Abandoned improper use of MyISAM data.
Thanks Ingo!

into ice.snake.net:/Volumes/ice2/MySQL/bk/mysql-4.1

without InnoDB.

  Added test case for bug #4256.
join_outer.result:
  Fixed bug #4256.
item_cmpfunc.h:
  Fixed inconsistency of values of used_tables_cache and
  const_item_cache for Item_func_isnull objects.
  This inconsistency caused bug #4256.

into rurik.mysql.com:/home/igor/mysql-4.1

into ice.snake.net:/Volumes/ice2/MySQL/bk/mysql-4.1

into rurik.mysql.com:/home/igor/mysql-4.1

into mysql.com:/home/kostja/work/mysql-4.1-4912

 a second time". The bug was caused by incompatibility of
negations elimination algorithm and PS: during first statement 
execute a subtree with negation was replaced with equivalent 
subtree without NOTs.
The problem was that although this transformation was permanent, 
items of the new subtree were created in execute-local memory.
The patch adds means to check if it is the first execute of a
prepared statement, and if this is the case, to allocate items
in memory of the prepared statement.
The implementation:
- backports Item_arena from 5.0
- adds Item_arena::is_stmt_prepare(), 
  Item_arena::is_first_stmt_execute().
- deletes THD::allocate_temporary_pool_for_ps_preparing(),
  THD::free_temporary_pool_for_ps_preparing(); they
  were redundant.
and adds a few invariants:
- thd->free_list never contains junk (= freed items)
- thd->current_arena is never null. If there is no
  prepared statement, it points at the thd. 
The rest of the patch contains mainly mechanical changes and
cleanups.

  Fixed it to work, added function to fix include/mysql_version.h LICENSE tag from GPL to Commercial

into rurik.mysql.com:/home/igor/mysql-4.1

into serg.mylan:/usr/home/serg/Abk/mysql-4.1

into mysql.com:/home/jonas/src/mysql-4.1

into build.mysql.com:/users/rburnett/mysql-4.1

into rurik.mysql.com:/home/igor/dev/mysql-4.1-0

into mysql.com:/home/jonas/src/mysql-4.1

into ice.snake.net:/Volumes/ice2/MySQL/bk/mysql-4.1

Fix for MyISAM. Tests for MyISAM and HASH+BTREE.

into mysql.com:/home/jonas/src/mysql-4.1