Code optimization to make it look better and work faster.

  Fix for compilation failure when HAVE_CHARSET_ucs2 is not defined.

character set introducer": add new item type to be returned before from 
Item_param until it's value is set.
This way items like Item_bool_func2 and udf_handler won't treat this item
as constant literal when statement is prepared.

  hpux make fix

into poseidon.bredbandsbolaget.se:/home/tomas/mysql-4.1

  compile error on hpux

No commit message

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

into poseidon.bredbandsbolaget.se:/home/tomas/mysql-4.1

into mysql.com:/home/kostja/mysql/mysql-4.1-4030

  Remove the use of mem_realloc in fil0fil.c; mem_realloc() was broken and the patch to remove its definition will propagate from the 4.0 tree; crash recovery with innodb_file_per_table has to be tested after this patch, not tested yet

into mysql.com:/home/kostja/mysql/mysql-4.1-4030

into kite-hub.kitebird.com:/src/extern/MySQL/bk/mysql-4.1

  Delete: ndb/bin/mysqlclusterd
.del-mysqlcluster_install_db~f363f803506081a6:
  Delete: ndb/bin/mysqlcluster_install_db
.del-mysqlcluster~26c9c37938503734:
  Delete: ndb/bin/mysqlcluster

into poseidon.bredbandsbolaget.se:/home/tomas/mysql-4.1

into mysql.com:/space/my/mysql-4.1

- mutex was unlocked before the end of the critical sesion,
- Portability issue: It's better to use (*alloc)(x) instead of alloc(x),
  if alloc is a function passed as an argument.
- Use {} around if() block, to avoid possible problems with some Windows compilers.

  missing file

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

   enabled

pops up fixed.

  fix up test result.

into ice.snake.net:/Volumes/ice2/MySQL/bk/mysql-4.1

and affected test results.

  Return the code of row_ins_foreign_check_on_constraint() as close to 4.0 as possible, except that we use mem_strdup() to allocate the memory for the modified table name

  introduced in ChangeSet@1.1843.1.25
InnoDB: fix bug in the error exit of
  fil_create_new_single_table_tablespace(), introduced in
  ChangeSet@1.1843.1.11