- In function 'handle_grant_struct' when searching the memory structures for an 
   entry to modify, convert all entries here host.hostname is NULL to "" and compare that 
   with the host passed in argument "user_from".
 - A user created with hostname "" is stored in "mysql.user" table as host="" but when loaded into 
   memory it'll be stored as host.hostname NULL. Specifiying "" as hostname means
   that "any host" can connect. Thus is's correct to turn on allow_all_hosts
   when such a user is found. 
 - Review and fix other places where host.hostname may be NULL.

Fix problem with strange printout of line numbers, detected on aix52, but existing on all platforms, just being masked by init of vars to zero.

into  mysql.com:/usr_rh9/home/elkin.rh9/MySQL/mysql-5.0

There is a specific rpl_ignore_grant test case for GRANT.

into  neptunus.(none):/home/msvensson/mysql/wl2930/my50-wl2930-integration

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

into  neptunus.(none):/home/msvensson/mysql/wl2930/my50-wl2930-integration

into  neptunus.(none):/home/msvensson/mysql/bug15598/my50-bug15598

into  neptunus.(none):/home/msvensson/mysql/bug15598/my50-bug15598

- Comparing host string against NULL caused crash. 
- If host.hostname is NULL treat it as ""

into  neptunus.(none):/home/msvensson/mysql/yassl_link_problem/my50-yassl_link_problem

into  neptunus.(none):/home/msvensson/mysql/bug15598/my50-bug15598

 - When acl_user->host.hostname is NULL compare it as ""

Add a symlink to extra/yassl/include/openssl to inlude/ when compiling with yassl
Similiar to readline)

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

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

Fixed bug #14274: a query with a having clause containing only set function returned a wrong result set.

into  mysql.com:/home/jimw/my/mysql-5.0-clean

into  mysql.com:/home/my/mysql-5.0

- Fixed tests
- Optimized new code
- Fixed some unlikely core dumps
- Better bug fixes for:
  - #14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
  - #14850 (ERROR 1062 when a quering a view using a Group By on a column that can be null

into  mysql.com:/usr/local/mysql/mysql-5.0

into  mysql.com:/home/jimw/my/mysql-5.0-clean

into  mysql.com:/usr/local/mysql/mysql-5.0

into  mysql.com:/opt/local/work/mysql-5.0-merge

into  mysql.com:/usr/local/mysql/mysql-5.0

parent when we are not the process group leader.

into  mysql.com:/opt/local/work/mysql-5.0-merge

when high concurrency": remove HASH::current_record and make it
an external search parameter, so that it can not be the cause of a 
race condition under high concurrent load.
The bug was in a race condition in table_hash_search,
when column_priv_hash.current_record was overwritten simultaneously
by multiple threads, causing the search for a suitable grant record
to fail.
No test case as the bug is repeatable only under concurrent load.