PLpgSQL: list of scalars as row for assign stmt, fore and fors stms

Hello

This patch enhance possibilities fore, fors, assign statements and remove
not needed using row or record variable.

create function a(out x integer, out y integer) returns setof record as $$
declare r record;
begin
for x, y in select form data loop
return next;
end loop;
-- or --
for r in select * from data loop
x, y := r;
return next;
end loop;
return;
end; $$ language plpgsql;

This patch allow using qualified identifiers in fore and fors stmts too.

Best regards
Pavel Stehule

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