Use LEX charset instead of system one

removed all side effects from asserts for not to confuse casual reader

into serg.mysql.com:/usr/home/serg/Abk/mysql-4.1

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

(normal protocol only, prepared protocol already handles it)

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

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

  Move all charset recoding to the same place

  Unnesessary binary() calls have been removed

into gluh.mysql.r18.ru:/home/gluh/mysql-4.1.test

without arguments ...

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'