Add diagnostic printf to chack that number of connections for a user never drops below zero

into sanja.is.com.ua:/home/bell/mysql/bk/work-4.1

into sanja.is.com.ua:/home/bell/mysql/bk/work-4.1

  URGENT: MONTY AND SERGEI should check this patch! The patch fixes the memory corruption reported by a user. It happened because the code did not keep correct a count of how many connections a user has, and the user object got freed too soon if the same user had more than 1 connection. Also fix a typo by Sanja: 'and' is not a C operator, I think it should be &&

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

(but broke permission handling for *some* IP's after we started to compare in utf8)
Bug #1636

support 'parallel' updates and rallback of whole statement in case of error in evalueting value which should be assigned
(BUG#1484)

(BUG#1638)

into deer.(none):/home/hf/work/mysql-4.1.clean

into sanja.is.com.ua:/home/bell/mysql/bk/work-count-4.1

Description: When a table contains a 'float' field, and one of the functions
MAX, MIN, or AVG is used on that field, the system crashes.

into bar.mysql.r18.ru:/usr/home/bar/mysql-4.1

http://bugs.mysql.com/bug.php?id=1022
Description: When a table contains a 'float' field, and one of the functions
MAX, MIN, or AVG is used on that field, the system crashes.

 - correct table name shown in EXPLAIN Iindex reference)
 - pointer on freed memmory (reallocation of table name in reusing table entry) can't be used in EXPLAIN
(BUG#1584)

  Reduce InnoDB memory allocation if buffer pool < 8 MB

(BUG#1444)

   patch)
  (BUG#1440: Redundant class name confusing hpux compiler)

removed unnesessary code from create.test

into mashka.mysql.fi:/home/my/mysql-4.1