- Better error message when table definition has changed

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

into mysql.com:/usr/local/home/marty/MySQL/mysql-4.1

into mysql.com:/usr/local/home/marty/MySQL/mysql-4.1

into mysql.com:/home/cps/mysql/trees/mysql-4.1

wait_for_pid function is fixed to wait for pid removal in "stop".
recomitted with post-review fix  

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

into mysql.com:/space/pekka/ndb/version/my41

platforms": yet another issue with floating pointer comparisons.
The fix uses the workaround with volatiles.

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

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

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

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

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

fixed bug in IN/ALL/ANY subqeries with HAVING clause (BUG#9350)

  Added option --with-big-tables

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

  Added option --with-blackhole

Argh!