Simplification of the previous fix for multi-update/delete.

into rurik.mysql.com:/home/igor/dev/mysql-4.0-1

  Fixed a bug causing a crash for multi-update/multi-delete
  with impossible where (bug #1860).

make a test for -inf more portable (-Inf)

Fixed mysqldump test.

into mysql.com:/my/mysql-4.0

mysql_server_init() now returns error code if something went wrong (Bug #2062)
Don't use my_fopen() when reading symlink information as this may cause problems when a lot of files are opened.
Free thread keys with pthread_key_delete() instead of relying on automatic free. (Bug #2062)
Fixed bug in UNION statement with alias '*'. (Bug #1249)
Fixed a bug in DELETE ... ORDER BY ... LIMIT where the rows where not deleted in the proper order. (Bug #1024).
FOUND_ROWS() could return incorrect number of rows after a query with an impossible WHERE condition.
HOW DATABASES doesn't anymore show .sym files (on windows) that doesn't point to a valid directory. (Bug #1385)

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

into mysql.com:/home/kostja/mysql/mysql-4.0-1993

into gluh.mysql.r18.ru:/home/gluh/mysql-4.0.ssl

(in addition to CS 1.1623 03/12/09)

into gluh.mysql.r18.ru:/home/gluh/mysql-4.0.ssl

into gw.mysql.r18.ru:/usr/home/ram/work/4.0.b2005

into deer.(none):/home/hf/work/mysql-4.0.1890

introduced base class Item_func_bit for bit functions

into mysql.com:/home/kostja/mysql/mysql-4.0-1790

into mysql.com:/home/kostja/mysql/mysql-4.0-1790

SQL_BIG_RESULT used": now BIT_AND() always returns 18446744073709551615
if no rows were found.
This patch also fixes bug #1972: "BIT_AND() and BIT_OR() still return 
a *signed* 64bit value"

into mysql.com:/my/mysql-4.0

into mysql.com:/home/kostja/mysql/mysql-4.0-1335

--disable_query_log was not a good idea, Serg says

into mysql.com:/my/mysql-4.0

Added checking of return value from malloc() in reg_init()

into sanja.is.com.ua:/home/bell/mysql/bk/work-qc-4.0

into sanja.is.com.ua:/home/bell/mysql/bk/work-qc-4.0

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

into mysql.com:/my/mysql-4.0

#2005 Long decimal comparion bug.                                               
#2055 mysqldump should replace "-inf" numeric field values with "NULL"

Otherwise, if the previous run ended with a crash, and the PID was 1234,
and you have rebooted the machine and the new PID is 99 then in the PID
file you will have 9934.
Note: users of mysqld_safe did not have the problem because this script
deletes the PID file before starting mysqld.