Add support for debuggers and impove support for valgrind

Makes it easier to see what happened before the failure

into  perch.ndb.mysql.com:/home/jonas/src/mysql-4.1

into  perch.ndb.mysql.com:/home/jonas/src/mysql-4.1

    ndb crash if trigger record get to big, fix incorrect max size of trigger record

into  mysql.com:/home/mydev/mysql-4.1-bug14980

For "count(*) while index_column = value" an index read
is done. It consists of an index scan and retrieval of
each key.

For efficiency reasons the index scan stores the key in
the special buffer 'lastkey2' once only. At the first 
iteration it notes this fact with the flag 
HA_STATE_RNEXT_SAME in 'info->update'.

For efficiency reasons, the key retrieval for blobs
does not allocate a new buffer, but uses 'lastkey2'...

Now I clear the HA_STATE_RNEXT_SAME flag whenever the 
buffer has been polluted. In this case, the index scan
copies the key value again (and sets the flag again).

  (not possible from SQL in 4.1 & 5.0)

  - Back porting of some changes in later releases
  - Corrected valgrind support
  - Removed work around for TZ needed in VisualStudio 6
  - Don't restart master to add special settings from "<testcase>-master.opt",
    if same settngs as running master, feature request in bug#12433
  - With --reorder, keep tests with same *-master.opt content together,
    to save even more master restarts

into  neptunus.(none):/home/msvensson/mysql/bug17137/my41-bug17137

 - Decrease "slave_open_temp_tables" during reopen of truncated table.
 - Add test "rpl_trunc_temp" 

  Allow space in base directory path, bug#15736

into  mysql.com:/usr/home/bar/mysql-4.1.b15949

  Check if the host of table hash record exactly matches host from GRANT command

it breaks binary compatibility. The patch will be left intact
in 5.1.

into  mysql.com:/opt/local/work/mysql-4.1-root

into  mysql.com:/home/mydev/mysql-4.1-bug11527

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1

  Better fix for do_sleep().

into  mysql.com:/usr/home/ram/work/4.1.b13659

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.0-r1.2173

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478

  revise README.

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478

  Revise README.gcov.

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1

  Revise mysql-test README.

into mysql.com:/M40/comment-4.0

into mysql.com:/M41/comment-4.1

union.result, union.test:
  Adding test case.
item.cc:
  Allow safe character set conversion in UNION
  - string constant to column's charset
  - to unicode
  Thus, UNION now works the same with CONCAT (and other string functions)
  in respect of aggregating arguments with different character sets.