Removing valgrind memory checks from code.

Patch to fix valgrind warning that uninitialized bytes were written. 
The warning was caused by set_default(), which assumes that the field pointer is pointing
into record[0], while all other functions honors the move_field_offset().

into  romeo.(none):/home/bk/memcheck-mysql-5.1

Removing DBUG_DUMP printouts for valgrind builds since they trigger warnings.
Removing valgrind memory checks completely.
Removing bzero() of record when opening table that was added earlier.

into  romeo.(none):/home/bk/memcheck-mysql-5.1

Fix to correct behaviour of find_and_fetch_row() for tables that have primary keys stored
in storage engines that support the fast method to fetch rows given a primary key. The
method uses position() to retrieve the key for a given record and rnd_pos() to position
the internal "cursor" at the row. Rnd_pos() returns the found record in table->record[0],
so the record has to be moved to table->record[1] for further processing after calling
find_and_fetch_row().

into  amd64.:D:/src/mysql-5.1_bug23983

- When a shared library argument is supplied, it's checked for an OS
specific directory separator. The expected error is different
depending on the separator used. Create OS specific versions of these
tests.

  - Disconnect from transporter before starting to delete objects

  
  open_table_from_share did not initialize table->record members. that was
  interpreted as the error by valgrind.
  
  Fixed with bzero-ing the members if compilation with -DHAVE_purify.

into  romeo.(none):/home/bk/memcheck-mysql-5.1

Adding class to handle temporary allocate of memory during write of rows.
Eliminating cut'n-paste error between THD::binlog_{write,update,delete}_row().

into  mysql.com:/home/bk/MERGE/mysql-5.1-merge

into  mysql.com:/home/bk/MERGE/mysql-5.0-merge

into  mysql.com:/home/bk/MERGE/mysql-5.1-merge

into  mysql.com:/home/bk/MERGE/mysql-5.0-merge

into  mysql.com:/home/bk/MERGE/mysql-5.1-merge

into  mysql.com:/home/bk/MERGE/mysql-5.0-merge

into  mysql.com:/home/bk/MERGE/mysql-4.1-merge

into  dsl-hkibras-fe30f900-107.dhcp.inet.fi:/home/elkin/MySQL/TEAM/BARE/mysql-5.1-new-rpl

into  dsl-hkibras-fe30f900-107.dhcp.inet.fi:/home/elkin/MySQL/TEAM/BARE/5.0

mending windows test.

into  kahlann.erinye.com:/home/df/mysql/build/mtr-5.0

into  kahlann.erinye.com:/home/df/mysql/build/mtr-5.0

into  kahlann.erinye.com:/home/df/mysql/build/51

into  kahlann.erinye.com:/home/df/mysql/build/mtr-5.0

into  kahlann.erinye.com:/home/df/mysql/build/51

into  kahlann.erinye.com:/home/df/mysql/build/mtr-5.0

into  trift2.:/MySQL/M50/mysql-5.0

into  dsl-hkibras-fe30f900-107.dhcp.inet.fi:/home/elkin/MySQL/TEAM/FIXES/merge_50_1

ver 5.0 and 5.1 refinement.
adding to the MAX_SIZE_LOG_EVENT_STATUS estimation status vars and 
EXECUTE_LOAD_QUERY_EXTRA_HEADER_LEN

this caused mysql_client_test to fail when running from binary dist 

into  mysql.com:/home/bk/MERGE/mysql-5.1-merge

into  mysql.com:/home/bk/MERGE/mysql-5.0-merge

into  romeo.(none):/home/bk/b18581-mysql-5.1-new-rpl