fixed * without tables in IN bug

fixed sunction-test select in IN bug
fixed unions in subselect bug


include/mysqld_error.h:
  new warning
mysql-test/r/subselect.result:
  test of * without tables in IN
  test of sunction-test select in IN
  test of unions in subselect
mysql-test/t/subselect.test:
  test of * without tables in IN
  test of sunction-test select in IN
  test of unions in subselect
sql/item.cc:
  fixed * substitution without tables
sql/item_subselect.cc:
  fixed subselect rewriting with function-test subselect
sql/item_subselect.h:
  mechanism for subselect removing
sql/share/czech/errmsg.txt:
  new warning
sql/share/danish/errmsg.txt:
  new warning
sql/share/dutch/errmsg.txt:
  new warning
sql/share/english/errmsg.txt:
  new warning
sql/share/estonian/errmsg.txt:
  new warning
sql/share/french/errmsg.txt:
  new warning
sql/share/german/errmsg.txt:
  new warning
sql/share/greek/errmsg.txt:
  new warning
sql/share/hungarian/errmsg.txt:
  new warning
sql/share/italian/errmsg.txt:
  new warning
sql/share/japanese/errmsg.txt:
  new warning
sql/share/korean/errmsg.txt:
  new warning
sql/share/norwegian-ny/errmsg.txt:
  new warning
sql/share/norwegian/errmsg.txt:
  new warning
sql/share/polish/errmsg.txt:
  new warning
sql/share/portuguese/errmsg.txt:
  new warning
sql/share/romanian/errmsg.txt:
  new warning
sql/share/russian/errmsg.txt:
  new warning
sql/share/serbian/errmsg.txt:
  new warning
sql/share/slovak/errmsg.txt:
  new warning
sql/share/spanish/errmsg.txt:
  new warning
sql/share/swedish/errmsg.txt:
  new warning
sql/share/ukrainian/errmsg.txt:
  new warning
sql/sql_base.cc:
  fixed case on no name field in UNION subselect
sql/sql_lex.cc:
  mechanisp of removing single subselect for optimisation purposes
sql/sql_lex.h:
  mechanisp of removing single subselect for optimisation purposes
sql/sql_parse.cc:
  error handling
sql/sql_union.cc:
  fixed unions in subselect
sql/sql_yacc.yy:
  fixed Lex->describe flag appearence

sql/share/japanese/errmsg.txt

@@ -249,3 +249,4 @@
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",
 "Reference '%-.64s' not supported (%s)",
+"Select %u was reduced during optimisation",