and BUG#1654: Stored Procedure Crash if contains subquery and set function

Disallowed subselects in RETURN (for FUNCTIONs) and SET of local variables.
The latter should work, but turned out to be difficult to fix, so we just
disallow it for the time being.


include/mysqld_error.h:
  New error message for unsupported subselect as SP set values (for the time being).
include/sql_state.h:
  New error message for unsupported subselect as SP set values (for the time being).
mysql-test/r/sp-error.result:
  Test cases for BUG#336 and BUG#1654. (Unsupported use of subselect)
mysql-test/t/sp-error.test:
  Test cases for BUG#336 and BUG#1654. (Unsupported use of subselect)
sql/item.cc:
  Made Item_splocal::type() work at compile time, for error checking.
sql/item.h:
  Made Item_splocal::type() work at compile time, for error checking.
sql/share/czech/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/danish/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/dutch/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/english/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/estonian/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/french/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/german/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/greek/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/hungarian/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/italian/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/japanese/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/korean/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/norwegian-ny/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/norwegian/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/polish/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/portuguese/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/romanian/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/russian/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/serbian/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/slovak/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/spanish/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/swedish/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/share/ukrainian/errmsg.txt:
  New error message for unsupported subselect as SP set values (for the time being).
sql/sp_head.cc:
  Fixed (bogus) compile error on HP-UX alpha.
sql/sql_yacc.yy:
  Disallowed subselects in RETURN (for FUNCTIONs) and SET of local variables.
  The latter should work, but turned out to be difficult to fix, so we just
  disallow it for the time being.