Added CEIL as an alias for CEILING
Cleaned up CHECK constraint handling.
(We don't anymore require braces after CHECK)
Added casting to CHAR.


mysql-test/r/bigint.result:
  Moved casting test to cast.test
mysql-test/r/func_time.result:
  Test of new functions
mysql-test/t/bigint.test:
  Moved casting test to cast.test
mysql-test/t/func_time.test:
  Test of new functions
sql/item_create.cc:
  Added casting to CHAR
sql/item_func.h:
  Added casting to CHAR
sql/item_timefunc.h:
  Added casting to CHAR
sql/lex.h:
  Added new ANSI functions LOCALTIME, LOCALTIMESTAMP and CURRENT_USER
  Added CEIL as an alias for CEILING
sql/sql_yacc.yy:
  Cleaned up CHECK constraint handling.