1. take care of NULL for unique non-composite indexes 2. NO_UNDO_NEEDED as a separate flag added 3. NOT_LOADED works properly in Attribute.__set__
1. take care of NULL for unique non-composite indexes
2. NO_UNDO_NEEDED as a separate flag added
3. NOT_LOADED works properly in Attribute.__set__

git-svn-id: cc65bc9ed7fa717314bc8890b6f123117eea230e@1338 698dff77-f410-0410-8918-cf622e150f36

gwecho/pony,gwecho/pony,ponyorm/pony,gwecho/pony,ponyorm/pony,ponyorm/pony,ponyorm/pony