[Initia import
Matthieu Sozeau <mattam@mattam.org>**20070130114952] 
[update to new order syntax
Matthieu Sozeau <mattam@mattam.org>**20070201102116] 
[No more obligations remaining
Matthieu Sozeau <mattam@mattam.org>**20070205123935] 
[Fix nth def
Matthieu Sozeau <mattam@mattam.org>**20070330184921] 
[Richly specified folds
Matthieu Sozeau <mattam@mattam.org>**20070822120734] [New subset syntax
Matthieu Sozeau <mattam@mattam.org>**20080201121559]