LTRIM, RTRIM and TRIM now work fine with ucs2

correct bug with empty table

into deer.(none):/home/hf/work/mysql-4.1.emb_bind

into deer.(none):/home/hf/work/mysql-4.1.emb_bind

splittiln common client's parts

Some default_charset_info were removed

SHOW COLLATION columns have been removed:
  D -> Default
  C -> Compiled
  Y -> Yes

  define ILSEQ for platforms that do not define it themself

Here is another pack of changes about gathering common client code in
sql-common/client.c.
Now i symlink the client.c from sql/ and libmysql/. These directories
have client_settings.h files to be included to client.c. It contains
defines and declarations to compile client.c in appropriate manner.
Also i've added include/sql_common.h, containing declarations of what
is exported from client.c

I removed as many #ifdef-s from client.c as i dared to. I think it's better
push it with some extra #ifdef-s now (of course, if everythihg besides it is
ok) so other people can check the code.

SCRUM
BUG
correct wrong code in group_concat

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

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

character_set_results is now the same with character_set_client by default

into mysql.r18.ru:/usr/home/ram/work/4.1.latest

into deer.(none):/home/hf/work/mysql-4.1.emb_bind

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

into eagle.mysql.r18.ru:/home/vva/work/NEW_HELP/4.1.clear

  mysqldump now produces SET NAMES. It can be disabled by --no-set-names

  character_set_connection new variable

character_set_database was added
Code optimization: reuse more code for all character sets variables

into mysql.r18.ru:/usr/home/ram/work/4.1.latest

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

(bug #518 fixed)

SELECT CAST(_latin1'string' AS CHAR CHARACTER SET latin2)

  bug #521 fix: ('3'='4')  was true in cp1250_czech_ci

./configure --with-charset=latin1 --with-collation=latin1_danish_ci

  ifdef wrong structure has been fixed