after introducing Item_equal.

  Fixed a problem a with special cases of IS NULL usage
  caused by some erroneous change made when Item_equal
  was introduced.

  Added tests for != predicate.
sql_select.cc:
  Fixing bugs in Item_equal code:
  added a parameter in substitute_for_equal_field;
  modified eliminate_item_equal.
sql_list.h:
  Cleanup

into rurik.mysql.com:/home/igor/dev/mysql-5.0-1

  Fixed inconsistency of values of used_tables_cache
  and const_item_cache for Item_func_isnull objects (bug #1990).

  Fixed inconsistency of values of used_tables_cache
  and const_item_cache for Item_func_isnull objects (bug #1990).
item_cmpfunc.h:
  Fixed inconsistency of values of used_tables_cache
  and const_item_cache for Item_func_isnull objects (bug #1990).

Added --protocol to mysqlbinlog

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

into mysql.com:/my/mysql-4.1

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

It happens that mysql->client_next->client_next=mysql
and mysql_close() goes into infinite loop.
Results vary from simple sigsegv (FreeBSD), to hard system lockup (Linux)
:)

into mysql.com:/home/mysql_src/mysql-4.1

the relay log before flushing master.info.
Doing 'before' leads to duplicate event, doing after leads to missing event.
Both can be as destructive, but 'duplicate' enables us to later add detection
code to catch it. Whereas 'missing' can't be caught (it can't, because
the I/O thread can produce legal position jumps, for example if it has
ignored an event coming from this slave (rememember that starting from 4.1.1,
the I/O thread filters the server id). 

into mysql.com:/home/kostja/mysql/mysql-4.1-root

into mysql.com:/my/mysql-4.0

into mysql.com:/my/mysql-4.1

into mysql.com:/my/mysql-4.1

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

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

Fixed compiler warnings (a lot of hidden variables detected by the Forte compiler)
Added a lot of 'version_xxx' strings to 'show variables'
Prevent copying of TMP_TABLE_PARAM (This caused core dump bug on Solaris)
Fixed problem with printing sub selects to debug log

into mysql.com:/home/kostja/mysql/mysql-4.1-wl519

Client option secure-auth deployed on all possible layers:
- mysql client command-line and config file option
- mysql_options option MYSQL_SECURE_AUTH
- mysql_real_connect will automatically take into account that option if
  mysql->options.my_cnf_file/my_cnf_group is set

2 forgotten 'break;' statements added

into mysql.com:/home/kostja/mysql/mysql-4.0-root

options.rpl_probe} as they are zero-initialized in spawn_init()

no need to set rpl_parse, rpl_probe and rpl_pivot to zero as whole mysql
structure is bzeroed in mysql_init(0) few lines before