Fix problem when creating shadow table

     since NDB$FRAGMENT is automatically added, there was a over run in the struct

This is a merge of 5.0 -> 5.1 + some code from old 5.1 tree to get all tests to work and keep the .frm format the same as the old 5.1 tree.

into  mysql.com:/home/my/mysql-5.1

(Main reason for reordering was to get rid of compiler warnings for order of element initialization)

into  mysql.com:/my/mysql-5.0

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

(Caused sp-security to fail)

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

into  mysql.com:/my/mysql-5.0

Destroy LOCK_uuid_generator

into  hasky.mysql.fi:/home/jani/mysql-5.0

into  fedora.(none):/home/reggie/bk/mysql-5.0-new

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-5.0

into mysql.com:/home/hf/work/mysql-5.0.9551

into mysql.com:/home/hf/work/mysql-5.0.9551

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-5.0

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-5.0

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-5.0-tmp

  Additional fix for bug#14093

that in mysql_rm_table_part2_with_lock() previously we needed to open
same file twice. Now once is enough.

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-5.0-tmp

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-5.0-tmp

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-5.0-tmp

into  mysql.com:/opt/local/work/mysql-5.0-14210

into mysql.com:/home/hf/work/mysql-5.0.9551

large table gives server crash": make sure that when a MyISAM temporary
table is created for a cursor, it's created in its memory root,
not the memory root of the current query.

into  ua141d10.elisa.omakaista.fi:/home/my/bk/mysql-4.1

into mysql.com:/home/hf/work/mysql-5.0.9551

into moonbone.local:/work/14093-bug-5.0-mysql

into mysql.com:/home/hf/work/mysql-5.0.9551

Invalid date like 2000-02-32 wasn't converted to int, which lead to not
using index and comparison with field as astring, which results in slow
query execution.

convert_constatn_item() and get_mm_leaf() now forces MODE_INVALID_DATES to
allow such conversion.