Fix bug #5975 about UTF-8 chars and prefix indexes; do not print warnings if a column prefix is > 255 bytes

  To make client_test work as mysql-test-run test case, needs to install it

into mysql.com:/media/sda1/mysql/mysql-4.1-5748-anew

crashes mysqld": implementation for a generic item tree modifications
registry. Every item tree modification which should be rolled back for
subsequent execution of a prepared statement or stored procedure should
be saved in the registry. All such modifications are rolled back at once
during cleanup stage of PS.
Actual fix for the bug just adds a call to register modifications to
convert_constant_item.
Post review fixes implemented.

into a80-186-41-201.elisa-laajakaista.fi:/home/my/bk/mysql-4.1

  Fix bug #5137: if innodb_file_per_table was specified, CREATE TEMPORARY TABLE ... TYPE=InnoDB said that cannot find path specified, and made mysqld to exit(1)

 - Updated Docs/Makefile.am and scripts/make_win_src_distribution.sh
   accordingly

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

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

  ...

  Merge manually the InnoDB mysqldump -l crash patch (crash with LOCK TABLES ... LOCAL) from 4.0 to 4.1; some code cleanup

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

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

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

function being used before it was defined - "forward" declaration
was insufficient.

differently when converting column to auto_increment in 4.1" with
current tree.

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

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

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

to auto_increment in 4.1".
Now we are enforcing NO_AUTO_VALUE_ON_ZERO mode during ALTER TABLE only
if we are converting one auto_increment column to another auto_increment
column (this also includes most common case when we don't do anything
with such column).

Also now when we convert some column to TIMESTAMP NOT NULL column with
ALTER TABLE we convert NULL values to current timestamp, (as we do this
in INSERT). One can still get old behavior by setting system TIMESTAMP
variable to 0.

into brian-akers-computer.local:/Users/brian/mysql/mysql-4.1

Some bigger code changes was necessary becasue of the multi-table-update and the new HANDLER code

Clean up from Bar and Antony code review. Found an issue with the header file were it could end up corrupted.

into build.mysql.com:/users/rburnett/mysql-4.0

mysqld.cc:
  Added call to create_pid_file to start_signal_handler on windows.  Also removed the #ifndef WINDOWS from two calls that deletes the pid file

Noteworthy:
- New HANDLER code
- New multi-update-grant-check code
- Table lock code in ha_innodb.cc was not applied

and testcases

into gw.mysql.r18.ru:/usr/home/ram/work/4.0.b5733

into brian-akers-computer.local:/Users/brian/mysql/mysql-4.1