mysql-test/r/view.result:
  test of subqueries in merged views
mysql-test/t/view.test:
  test of subqueries in merged views
sql/item_subselect.h:
  new method tu return place of subquery
sql/sql_lex.cc:
  allow merging views with subqueries in WHERE clause
sql/sql_view.cc:
  allow merging views with subqueries in WHERE clause