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

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

  Put a note that the InnoDB HANDLER code is not used until 4.1, and appears for documentational purposes only

now it should be safe to do 'bk rmgone' to make the tree ~25M less :)

  Cleanup of latest rewrite of innobase_mysql_print_thd; from now on changing this code is forbidden unless a written permission is received from Heikki 3 days in advance

manual.texi	Add entry for QUOTE() function.