fix a race condition in TC_LOG_BINLOG::unlog

minor cleanups
XA tests

into sanja.is.com.ua:/home/bell/mysql/bk/work-union_merge-5.0

into mysql.com:/home/svoj/devel/mysql/mysql-5.0

openssl_1 and rpl_openssl results difference

into serg.mylan:/usr/home/serg/Abk/mysql-5.0

into msdesk.mysql.com:/home/magnus/mysql-5.0

 - When deleting from a cursor the m_rows_changed variable was not properly incremented to indicate that m_share->commit_count should be cleared at end of trans.
  

into neptunus.(none):/home/msvensson/mysql/mysql-5.0

into mysql.com:/usr/local/bk/mysql-5.0

into neptunus.(none):/home/msvensson/mysql/mysql-5.0

into mysql.com:/home/my/mysql-5.0

Fixed that datetime gives warning for zero dates in traditional mode

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

Fix 'Bootstrap' to bypass a problem with "bk changes" by changing the directory before calling the command.

into neptunus.(none):/home/msvensson/mysql/mysql-5.0

  Sedond attempt: Simply disallow CHECK in SPs, since it can't work.

into mysql.com:/home/my/mysql-5.0

Small fixes while doing review of new pushed code
More test cases for decimal

into mysql.com:/usr/home/ram/work/mysql-5.0

into neptunus.(none):/home/msvensson/mysql/mysql-4.1-synced

into serg.mylan:/usr/home/serg/Abk/mysql-5.0

Make test_if_skip_sort_order() rebuild tab->ref if it decides to use an index
different from the index join optimizer has choosen.  

 - Add function Item_param::fix_fields which will update any subselect they are part of and indicate that the subsleect is not const during prepare phase, and thus should not be executed during prepare.

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

into mysql.com:/usr/home/bar/mysql-4.1