independent ALL/ANY subselect on top of WHERE clause (subselect without GROUP BY or aggregate functions) optimisation

(SCRUM) (WL#1086)


mysql-test/r/subselect.result:
  new optimisation tests
mysql-test/t/subselect.test:
  new optimisation tests
sql/item_cmpfunc.cc:
  new NOT
sql/item_cmpfunc.h:
  new NOT
sql/item_subselect.cc:
  independent ALL/ANY in top of WHERE clause optimisation
sql/item_subselect.h:
  independent ALL/ANY in top of WHERE clause optimisation
sql/item_sum.cc:
  prevent fixlields call for parameters of min/max if it is already done
sql/sql_union.cc:
  removed debuging print
sql/sql_yacc.yy:
  support of ALL optimisation