After merge fix for collation.

  After merge fixes.

  After review fixes for Item_equal.

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

into mysql.com:/home/pem/work/mysql-5.0-merge

into bar.intranet.mysql.r18.ru:/usr/home/bar/mysql-4.1

into deer.(none):/home/hf/work/mysql-4.1.2211

previous one had error

into eagle.mysql.r18.ru:/home/vva/work/BUG_2593/mysql-4.1

into eagle.mysql.r18.ru:/home/vva/work/BUG_2593/mysql-4.1

into deer.(none):/home/hf/work/mysql-4.1.1438

"MySQL server does not detect if garbage chara at the end of query"

Allow the parser to see the garbage characters.
Garbage should cause the parser to report an error.

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

into mysql.com:/home/dlenev/src/mysql-4.1-bg2248

into bar.intranet.mysql.r18.ru:/usr/home/bar/mysql-4.1

CONVERT3 was removed, it was for test purposes,
and rather harmful.

into deer.(none):/home/hf/work/mysql-4.1.2208

Made code shorter and more correct

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

"MySQL server does not detect if garbage chars at the end of query":

Detect garbage chars at the end of the query or at the end of a query
for a prepared statement (which happens if mysql_real_query() or mysql_prepare()
were called with a too big 'length' parameter (bigger than the real intended
length of the query: then we receive a query + garbage characters from the
client). This resulted in garbage chars written into the binlog.
Now instead the client receives something like:
'You have an error in your SQL syntax.  Check the manual that corresponds
to your MySQL server version for the right syntax to use near '!stmt'
at line 1' i.e. the server is pointing at the weird tail of the query
(this '!stmt' are the garbage chars sent by the client).
All tests pass, except mysqldump.test and ctype_utf8.test but they failed
before the patch.

  No needs to load charset index if the character set is build-in.

into mysql.com:/home/dlenev/src/mysql-4.1-bg2248

into deer.(none):/home/hf/work/mysql-4.1.2208

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

added setting of 'neg' in Item_param::set_time() (looks like the only forgotten
member).
It's the second place I find where 'neg' was forgotten.
The symptom was unexpected negative times in the binary log when running
tests/client_test.c (test_date() in fact):
# at 43009
#040210 15:46:42 server id 1  log_pos 43009     Query   thread_id=1     exec_time=0     error_code=0
SET TIMESTAMP=1076424402;
INSERT INTO test_date VALUES('2000-01-10 11:16:20','-11:16:20' etc

into eagle.mysql.r18.ru:/home/vva/work/BUG_2592/mysql-4.1

in sql/sql_lex.cc

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