add Ord instances for 3 and 4-tuples
add Ord instances for 3 and 4-tuples

Ignore-this: b5501f8a6af7447f5270c9929099c4a0

darcs-hash:20090906093322-1a7c6-0bd80ffd3206af6d4375c74c412753a69295f613

kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc