Don't update MyISAM index file on UPDATE if index is not changed

Fixed bug in SAFEMALLOC for systems that requires longlong data to be aligned on 8 byte boundaries (like sparc)
Removed thread marking of safemalloc blocks (becasue of alignment problems)
Temporary fix for bigint comparison.

into hundin.mysql.fi:/my/bk/mysql-4.0

Fixed bug in SELECT DISTINCT ... ORDER BY not-used-column.
Fixed bug in pthread_mutex_trylock with HPUX 11.0

into sinisa.nasamreza.org:/mnt/work/mysql-4.0

Same princpile can be applied to other expressions

New fix for pthread_mutex_trylock for HPUX 10.20

 - Added 3.23.53 News section to the manual
 - Updated version number in configure.in to 3.23.53

  Add multithreaded stress tests for InnoDB
  new file

  In HP-UX-10.20 my_pthread_mutex_trylock erroneously returned 0 also in the case where the mutex was not acquired

  Fix an infinite recursion in my_pthread_mutex_trylock in HP-UX-10.20; the same bug is in the 4.0 tree

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

into sergbook.mysql.com:/usr/home/serg/Abk/mysql

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

"ungone" include/global.h, though deleted, otherwise bk cannot pull from 3.23 (where this fiule is legally present)

into teton.kitebird.com:/home/paul/mysql-4.0

able delay_key_write as default (as it was in 4.0.2)

  Fix a critical portability bug introduced in the Windows version