into mysql.com:/opt/local/work/mysql-5.0-join_free2push

into mysql.com:/opt/local/work/mysql-5.0-join_free2push

The reason it happened was that both, JOIN::cleanup() and JOIN::join_free(),
went over all nested joins and called cleanup/join_free for them.
For that:
- split recursive and non-recursive parts of JOIN::cleanup() and
JOIN::join_free()
- rename JOIN::cleanup to JOIN::destroy, as it actually destroys its
  argument
- move the recursive part of JOIN::cleanup to st_select_lex::cleanup
- move the non-recursive part of JOIN::join_free to the introduced
  method JOIN::cleanup().

into mysql.com:/home/mydev/mysql-5.0-bug8321

After merge fixes of test result.

Bug#10568 - Function 'LAST_DAY(date)' does not return NULL for invalid argument.
Manual merge.

Added 64-bit extensions, comments, extended statistics 
and trace prints.

Wrong comparing method were choosen which results in false comparison.

Make Item_bool_func2::fix_length_and_dec() to get type and field from
real_item() to make REF_ITEM pass the check. 

Moved the key statistics update to info().
The table is not locked in open(). This made wrong stats possible.

No test case for the test suite.
This happens only with heavy concurrency.
A test script is added to the bug report.

into rurik.mysql.com:/home/igor/mysql-5.0

  Correction after manula merge.

into sanja.is.com.ua:/home/bell/mysql/bk/work-bug3-5.0

into mysql.com:/home/timka/mysql/src/5.0-virgin

into sanja.is.com.ua:/home/bell/mysql/bk/work-bug3-5.0

into mysql.com:/home/timka/mysql/src/5.0-virgin

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

into sanja.is.com.ua:/home/bell/mysql/bk/work-bug3-5.0

into rurik.mysql.com:/home/igor/dev/mysql-5.0-0

into mysql.com:/home/svoj/devel/mysql/mysql-5.0.9

into mysql.com:/opt/local/work/mysql-5.0-sp_instr

into mysql.com:/home/psergey/mysql-5.0-bug8441

into mysql.com:/home/psergey/mysql-5.0-bug8441

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

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

into rurik.mysql.com:/home/igor/dev/mysql-4.1-1

into mysql.com:/home/psergey/mysql-4.1-bug10151

  Fix for fix for bug #9728
  Error caused server hang on prepared insert ... select

Fix for compilation failure with Forte Developer C++.