
GtkAcl :
	- Set acl to file only if needed (when deleting all acl users and groups remove acl)
	- Change edit mode (unix, ACL) on open file
	- Del the ACL
	- Manage default ACL
	- Gray buttons that done no action (ex : change owner if not root, ...)
	
GtkUserGroup :
	- Hide groups and users that cannot be Add (users already add, no permissions, ...)
	
	

Clean code, remove many bugs
Add item to right click context sensitive menu into nautilus
Maybe create patch to replace nautilus permissions editor by it
