SQL_BIG_RESULT used':
- BIT_AND now returns BIGINT UNSIGNED
- in case there were no matching rows BIT_AND returns 18446744073709551615 
(but not NULL), BIT_OR returns 0 (but not NULL). That's how Monty wants it
and how is described in our docs.




include/my_global.h:
  Added definition for ULONGLONG_MAX.
  This is also a check that ULL type specifier
  can be used on all supported platforms.
mysql-test/r/func_group.result:
  bug #1790, post-review work: test results fixed
sql/item_sum.cc:
  small cleanup
sql/item_sum.h:
  few style fixes.
  BIT_AND and BIT_OR now are both BIGINT UNSIGNED