Cleanup of multi-table-delete in sql_yacc.yy
Changed syntax of MAXIMUM QUERIES PER HOUR to MAX_QUERIES_PER_HOUR to
not get too many reserved words.


Docs/manual.texi:
  Updated information about CAST
mysql-test/r/bigint.result:
  New CAST syntax
mysql-test/r/create.result:
  New CAST syntax
mysql-test/r/variables.result:
  Fix after merge with 3.23
mysql-test/t/bigint.test:
  New CAST syntax
mysql-test/t/create.test:
  New CAST syntax
sql/item_create.cc:
  New CAST syntax
sql/item_func.h:
  New CAST syntax
sql/item_timefunc.cc:
  New CAST syntax
sql/item_timefunc.h:
  New CAST syntax
sql/lex.h:
  Changed syntax to MAX_QUERIES_PER_HOUR to not get too many reserved words.
sql/mysql_priv.h:
  Cleanup multi-delete
sql/sql_parse.cc:
  Cleanup multi-delete
sql/sql_yacc.yy:
  Cleanup multi-delete.
  New CAST syntax.
  Removed some restricted words.