resolve_const_item() assumed to be not called for Item_row items. For
ensuring that DBUG_ASSERT(0) was set there.

This patch adds section for Item_row items. If it can it recursively calls
resolve_const_item() for each item the Item_row contains. If any of the
contained items is null then whole Item_row substitued by Item_null. Otherwise
it just returns.

into  mysql.com:/users/lthalmann/bk/mysql-4.1-max

into  mysql.com:/home/mydev/mysql-4.1-4100

into  mysql.com:/home/mydev/mysql-4.1-4100

into mysql.com:/Users/kent/mysql/bk/mysql-4.1

  Revert to shell test script for test targets
mysqltest.c:
  Windows pclose() returns error code in low byte
mysql_config.sh:
  Remove -Xa -xstrconst from --cflags for Sun C++

into  mysql.com:/home/my/mysql-4.1

into mysql.com:/home/psergey/mysql-4.1-bug13419

  Fix out-of-order status variable.

After merge fix

not equivalent to "x=y" when item->negated == TRUE.

into  mysql.com:/home/mydev/mysql-4.1-4100

The problem was an ab-use of last_rkey_length.
Formerly we saved the packed key length (of the search key)
in this element. But in certain cases it got replaced by 
the (packed) result key length.
Now we use a new element of MI_INFO to save the packed key 
length of the search key.

into  mysql.com:/usr/home/ram/work/4.1.b11553

into mysql.com:/home/gluh/MySQL/Merge/4.1

  set auto_increment_field_not_null to true to preserve zero values
  for autoincrement fields during LOAD DATA execution if 
  NO_AUTO_VALUE_ON_ZERO sql mode is set

into  perch.ndb.mysql.com:/home/jonas/src/mysql-4.1-push

  ndb big alter table

into  mysql.com:/usr/home/ram/work/4.1.b11553

  ndb alter table with big dicttabinfo
  send alter_tab_req fragmented as signal can get larger than MAX_MESSAGE_SIZE

into  perch.ndb.mysql.com:/home/jonas/src/mysql-4.1-push

into  perch.ndb.mysql.com:/home/jonas/src/mysql-4.1-push

into  mysql.com:/home/jimw/my/mysql-4.1-clean

into  mysql.com:/home/jimw/my/mysql-4.1-clean

into moonbone.local:/work/13180-bug-4.1-mysql

thd->allow_sum_func was left 'true' after previous statement thus allowing
sum funcs to be present in conditions.

thd->allow_sum_func should be set to 0 for each query and each prepared
statement reinitialization. This is done in lex_start() and 
reset_stmt_for_execute().

into  mysql.com:/home/timka/mysql/src/4.1-dbg

into  perch.ndb.mysql.com:/home/jonas/src/mysql-4.1-push

    ndb backup with charsets and simultanious updates
    make sure that backup _dont_ read xfrm data

into  mysql.com:/home/my/mysql-4.1

This fixes the new report for bug #7036

into  perch.ndb.mysql.com:/home/jonas/src/mysql-4.1-push