IS_USED_LOCK('lock') implementation

Added expire-logs-days option 

into sinisa.nasamreza.org:/mnt/work/mysql-4.1

Major re-write of code yet has to be done, to circumvent
assigning of UNIT to current select and to deal better with 
offset, limit.

into myvenu.com:/home/venu/work/sql/dev-4.1

  some default_charset_info were removed

  LOAD DATA INFILE now uses database character set instead of server character set. This is not excellent but at least allows to load for example cyrillic data into cyrillic database if server charset is latin1. In the future we should add a syntax to specify file charset or evern charset of each field.

  use of new argument
sql_analyse.h:
  macros from mysql_priv.h. Should be deleted soon.
mysql_priv.h:
  _default_charset_info has been removed
item_cmpfunc.h:
  Use cmp_charset
hostname.cc, hash_filo.h:
  Move charset to constructor argument

SET COLLATION latin1
SET COLLATION 'latin1'
SET COLLATION DEFAULT

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

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

Added Centroid(), Area() tests for MultiPolygon objects.

Code clean-up according 'Coding Standards and Styles'

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

binary and primary collations in the future

SET NAMES <charset name> [COLLATE <collation name>]

into myvenu.com:/home/venu/work/sql/dev-4.1

  Remove the unused code (from previous commit)

Added new client tests (EXPLAIN + DECIMAL conv)

   distribution to fix a test failure in test "func_encrypt"

into mysql.com:/home/greg/bk/mysql-4.1

  Change mode to -rwxrwxr-x

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

  is now synonim for
SELECT expr COLLATE <expr_charset>_bin

into the only one sortcmp() with additional
CHARSET_INFO *cmp_charset argument.