new file
Many files:
  Nested joins added.


sql/item_cmpfunc.h:
  Nested joins added.
sql/item_func.h:
  Nested joins added.
sql/sql_base.cc:
  Nested joins added.
sql/sql_lex.cc:
  Nested joins added.
sql/sql_lex.h:
  Nested joins added.
sql/sql_parse.cc:
  Nested joins added.
sql/sql_select.cc:
  Nested joins added.
sql/sql_select.h:
  Nested joins added.
sql/sql_yacc.yy:
  Nested joins added.
sql/table.h:
  Nested joins added.
mysql-test/r/join_outer.result:
  Nested joins added.
mysql-test/r/select.result:
  Nested joins added.