removed switching off static table optimization for subselects (SCRUM , pre-commit  to be able merge with temporary table fix)



sql/item.cc:
  report other table for outer reference
sql/item.h:
  report other table for outer reference
sql/item_cmpfunc.cc:
  report other table for outer reference
sql/sql_select.cc:
  removed switching off static table optimization for subselects