many, many changes

mysql-test/r/subselect.result:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_lex.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged
include/mysqld_error.h:
  Merging changes ...
mysql-test/t/subselect.test:
  Merging changes ...
sql/share/czech/errmsg.txt:
  Merging changes ...
sql/share/danish/errmsg.txt:
  Merging changes ...
sql/share/dutch/errmsg.txt:
  Merging changes ...
sql/share/english/errmsg.txt:
  Merging changes ...
sql/share/estonian/errmsg.txt:
  Merging changes ...
sql/share/french/errmsg.txt:
  Merging changes ...
sql/share/german/errmsg.txt:
  Merging changes ...
sql/share/greek/errmsg.txt:
  Merging changes ...
sql/share/hungarian/errmsg.txt:
  Merging changes ...
sql/share/italian/errmsg.txt:
  Merging changes ...
sql/share/japanese/errmsg.txt:
  Merging changes ...
sql/share/korean/errmsg.txt:
  Merging changes ...
sql/share/norwegian-ny/errmsg.txt:
  Merging changes ...
sql/share/norwegian/errmsg.txt:
  Merging changes ...
sql/share/polish/errmsg.txt:
  Merging changes ...
sql/share/portuguese/errmsg.txt:
  Merging changes ...
sql/share/romanian/errmsg.txt:
  Merging changes ...
sql/share/russian/errmsg.txt:
  Merging changes ...
sql/share/serbian/errmsg.txt:
  Merging changes ...
sql/share/slovak/errmsg.txt:
  Merging changes ...
sql/share/spanish/errmsg.txt:
  Merging changes ...
sql/share/swedish/errmsg.txt:
  Merging changes ...
sql/share/ukrainian/errmsg.txt:
  Merging changes ...

sql/share/portuguese/errmsg.txt

@@ -247,4 +247,5 @@
 "Cyclic reference on subqueries",
 "Converting column '%s' from %s to %s",
 "Reference '%-.64s' not supported (%s)",
+"Every derived table must have it's own alias"
 "Select %u was reduced during optimisation",