Fix compile problem in sql_cache.cc

Fixed shutdown on HPUX.
Fixed bug in query cache.

  Removed a mirror in Netherlands
manual.texi:
  Remove link to outdated mod_log_mysql

horrible bug fixed

into serg.mysql.com:/usr/home/serg/Abk/mysql-4.0

  Add diagnostic code to find out why foreign key constraint creation sometimes fails

  Remove a theoretical overrun in adaptive hash index building

  Eliminate a Purify warning in a multithreaded test: the fields are not protected by a mutex, therefore they can be read uninitialized

into hynda.mysql.fi:/data/my/bk/mysql-4.0-quick-fixes

Added new tests to testsuite.

into serg.mysql.com:/usr/home/serg/Abk/mysql-4.0

into co3064164-a.bitbike.com:/home/arjen/mysql-4.0

Add 4.0 commands to SHOW STATUS.

New HEX() function.
Final (?) cleanup of des_encrypt() / des_decrypt().
Added missing files to Makefiles.

into co3064164-a.bitbike.com:/home/arjen/mysql-4.0

added extra/mysql_install.c - will work on it in 4.0, but it does not hurt
to have it sit in 3.23 tree for now since it will eventually be backported 
to 3.23 anyway