Merge mysql.com:/usr/home/bar/mysql-4.1-rpl.b8663

into  mysql.com:/usr/home/bar/mysql-5.0-rpl


mysql-test/r/cast.result:
  null merge for bug#8663
  It will beed another fix for 5.0
  - changes in new DECIMAL instead of FLOAT
mysql-test/r/ps.result:
  null merge
mysql-test/t/cast.test:
  null merge
mysql-test/t/count_distinct3.test:
  null merge
sql/item_func.cc:
  null merge